diff --git a/src/config/runtime-controls.ts b/src/config/runtime-controls.ts
index e07a259..e6b8a70 100644
--- a/src/config/runtime-controls.ts
+++ b/src/config/runtime-controls.ts
@@ -67,7 +67,7 @@ export const runtimeControls: GardenAppConfig['runtimeSettings']['controls'] = {
     folder: 'Movement',
     label: 'Travel Speed',
     min: 10,
-    max: 500,
+    max: 250,
     step: 1,
   },
   turnSpeed: {
@@ -116,6 +116,7 @@ export const runtimeControls: GardenAppConfig['runtimeSettings']['controls'] = {
 
   clarity: {
     folder: 'Look',
+    inverted: true,
     label: 'Sharpness',
     min: 0.00001,
     max: 1,
diff --git a/src/config/types.ts b/src/config/types.ts
index 456dec8..6f9aa29 100644
--- a/src/config/types.ts
+++ b/src/config/types.ts
@@ -12,6 +12,7 @@ export interface NumberControlConfig {
   format?: (value: number) => string;
   folder: string;
   integer?: boolean;
+  inverted?: boolean;
   label?: string;
   max?: number;
   min?: number;
diff --git a/src/page/config-pane.ts b/src/page/config-pane.ts
index 3e6c397..8bb7f28 100644
--- a/src/page/config-pane.ts
+++ b/src/page/config-pane.ts
@@ -81,6 +81,16 @@ const getNumberBindingParams = (config: NumberControlConfig): BindingParams => {
   return params;
 };
 
+const getInvertedNumberControlValue = (
+  value: number,
+  config: NumberControlConfig
+): number => {
+  if (!config.inverted || config.min === undefined || config.max === undefined) {
+    return value;
+  }
+  return config.min + config.max - value;
+};
+
 export class ConfigPane {
   private readonly container: HTMLDivElement;
   private readonly closeButton: HTMLButtonElement;
@@ -264,9 +274,10 @@ export class ConfigPane {
     }
 
     settings[key] = normalizeNumberControlValue(settings[key], config);
+    const bindingTarget = this.getRuntimeBindingTarget(key, config);
 
     container
-      .addBinding(settings, key, getNumberBindingParams(config))
+      .addBinding(bindingTarget, key, getNumberBindingParams(config))
       .on('change', () => {
         const nextValue = normalizeNumberControlValue(settings[key], config);
         if (nextValue !== settings[key]) {
@@ -277,6 +288,25 @@ export class ConfigPane {
       });
   }
 
+  private getRuntimeBindingTarget(
+    key: RuntimeControlKey,
+    config: NumberControlConfig
+  ): typeof settings | Record<RuntimeControlKey, number> {
+    if (!config.inverted) {
+      return settings;
+    }
+
+    const bindingTarget = {} as Record<RuntimeControlKey, number>;
+    Object.defineProperty(bindingTarget, key, {
+      enumerable: true,
+      get: () => getInvertedNumberControlValue(settings[key], config),
+      set: (value: number) => {
+        settings[key] = getInvertedNumberControlValue(value, config);
+      },
+    });
+    return bindingTarget;
+  }
+
   private getRuntimeControlConfig(
     key: RuntimeControlKey
   ): NumberControlConfig | undefined {
diff --git a/src/page/eraser-size-control.test.ts b/src/page/eraser-size-control.test.ts
new file mode 100644
index 0000000..6b2bbe8
--- /dev/null
+++ b/src/page/eraser-size-control.test.ts
@@ -0,0 +1,26 @@
+import { describe, expect, it } from 'vitest';
+
+import { appConfig } from '../config';
+import {
+  getEraserSizeFromSliderRatio,
+  getEraserSliderRatioFromSize,
+} from './eraser-size-control';
+
+describe('eraser size slider mapping', () => {
+  it('maps slider position quadratically to eraser size', () => {
+    const { max, min } = appConfig.toolbar.eraser;
+
+    expect(getEraserSizeFromSliderRatio(0)).toBe(min);
+    expect(getEraserSizeFromSliderRatio(0.5)).toBe(min + (max - min) * 0.25);
+    expect(getEraserSizeFromSliderRatio(1)).toBe(max);
+  });
+
+  it('maps eraser size back to the inverse slider position', () => {
+    const { max, min } = appConfig.toolbar.eraser;
+    const quarterRangeSize = min + (max - min) * 0.25;
+
+    expect(getEraserSliderRatioFromSize(min)).toBe(0);
+    expect(getEraserSliderRatioFromSize(quarterRangeSize)).toBe(0.5);
+    expect(getEraserSliderRatioFromSize(max)).toBe(1);
+  });
+});
diff --git a/src/page/eraser-size-control.ts b/src/page/eraser-size-control.ts
index 1099821..2c0e8a8 100644
--- a/src/page/eraser-size-control.ts
+++ b/src/page/eraser-size-control.ts
@@ -9,11 +9,28 @@ const clampEraserSize = (value: number): number => {
   return Math.min(max, Math.max(min, Math.round(safeValue)));
 };
 
+const ERASER_SLIDER_MIN = 0;
+const ERASER_SLIDER_MAX = 1;
+const ERASER_SLIDER_STEP = 0.001;
+
+const clampSliderRatio = (value: number): number => {
+  const safeValue = Number.isFinite(value) ? value : ERASER_SLIDER_MIN;
+  return Math.min(ERASER_SLIDER_MAX, Math.max(ERASER_SLIDER_MIN, safeValue));
+};
+
 const getEraserSizeRatio = (size: number): number => {
   const { max, min } = appConfig.toolbar.eraser;
-  return (size - min) / (max - min);
+  return (clampEraserSize(size) - min) / (max - min);
 };
 
+export const getEraserSizeFromSliderRatio = (sliderRatio: number): number => {
+  const { max, min } = appConfig.toolbar.eraser;
+  return clampEraserSize(min + (max - min) * clampSliderRatio(sliderRatio) ** 2);
+};
+
+export const getEraserSliderRatioFromSize = (size: number): number =>
+  Math.sqrt(getEraserSizeRatio(size));
+
 interface EraserSizeControlOptions {
   getGame: () => GameLoop | null;
   onActivate: () => void;
@@ -33,7 +50,7 @@ export class EraserSizeControl {
     this.control.addEventListener('click', this.activate);
     this.slider.addEventListener('focus', this.activate);
     this.slider.addEventListener('input', () => {
-      settings.eraserSize = clampEraserSize(Number(this.slider.value));
+      settings.eraserSize = getEraserSizeFromSliderRatio(Number(this.slider.value));
       this.activate();
       this.render();
       this.options.onChange();
@@ -46,19 +63,20 @@ export class EraserSizeControl {
       settings.eraserSize = size;
     }
 
-    this.slider.min = appConfig.toolbar.eraser.min.toString();
-    this.slider.max = appConfig.toolbar.eraser.max.toString();
-    this.slider.step = appConfig.toolbar.eraser.step.toString();
-    this.slider.value = size.toString();
+    const sliderRatio = getEraserSliderRatioFromSize(size);
+    this.slider.min = ERASER_SLIDER_MIN.toString();
+    this.slider.max = ERASER_SLIDER_MAX.toString();
+    this.slider.step = ERASER_SLIDER_STEP.toString();
+    this.slider.value = sliderRatio.toString();
     this.slider.setAttribute('aria-valuetext', `${size}px`);
 
-    const ratio = getEraserSizeRatio(size);
+    const sizeRatio = getEraserSizeRatio(size);
     const scale =
       appConfig.toolbar.eraser.controlScaleMin +
       (appConfig.toolbar.eraser.controlScaleMax -
         appConfig.toolbar.eraser.controlScaleMin) *
-        ratio;
-    this.control.style.setProperty('--eraser-progress', `${ratio * 100}%`);
+        sizeRatio;
+    this.control.style.setProperty('--eraser-progress', `${sliderRatio * 100}%`);
     this.control.style.setProperty('--eraser-control-scale', scale.toFixed(3));
     this.syncActiveState();
     this.options.getGame()?.updateEraserPreview();
diff --git a/src/utils/graphics/initialize-gpu.test.ts b/src/utils/graphics/initialize-gpu.test.ts
new file mode 100644
index 0000000..44bbd91
--- /dev/null
+++ b/src/utils/graphics/initialize-gpu.test.ts
@@ -0,0 +1,100 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+import { initializeGpu } from './initialize-gpu';
+
+const limits = {
+  maxBufferSize: 1024,
+  maxComputeWorkgroupsPerDimension: 16,
+  maxStorageBufferBindingSize: 1024,
+} as unknown as GPUSupportedLimits;
+
+const createDevice = (): GPUDevice =>
+  ({
+    addEventListener: vi.fn(),
+    lost: new Promise(() => undefined),
+  }) as unknown as GPUDevice;
+
+const createAdapter = (features: Array<GPUFeatureName> = []): GPUAdapter => {
+  const device = createDevice();
+  return {
+    features: new Set(features),
+    info: {},
+    limits,
+    requestDevice: vi.fn().mockResolvedValue(device),
+  } as unknown as GPUAdapter;
+};
+
+const stubSecureWebGpu = (requestAdapter: GPU['requestAdapter']): void => {
+  vi.stubGlobal('window', { isSecureContext: true });
+  vi.stubGlobal('navigator', {
+    gpu: {
+      requestAdapter,
+    },
+  });
+};
+
+describe('initializeGpu', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it('starts with the least demanding compatibility adapter request', async () => {
+    const adapter = createAdapter();
+    const requestAdapter = vi.fn().mockResolvedValue(adapter);
+    stubSecureWebGpu(requestAdapter as GPU['requestAdapter']);
+
+    await initializeGpu();
+
+    expect(requestAdapter).toHaveBeenNthCalledWith(1, {
+      featureLevel: 'compatibility',
+    });
+    expect(requestAdapter).toHaveBeenCalledTimes(1);
+    expect(adapter.requestDevice).toHaveBeenCalled();
+  });
+
+  it('continues trying adapters if one request throws', async () => {
+    const adapter = createAdapter();
+    const requestAdapter = vi
+      .fn()
+      .mockRejectedValueOnce(new Error('adapter request failed'))
+      .mockResolvedValueOnce(adapter);
+    stubSecureWebGpu(requestAdapter as GPU['requestAdapter']);
+
+    await expect(initializeGpu()).resolves.toBeDefined();
+    expect(requestAdapter).toHaveBeenCalledTimes(2);
+  });
+
+  it('falls back through core and high-performance adapter requests', async () => {
+    const adapter = createAdapter();
+    const requestAdapter = vi
+      .fn()
+      .mockResolvedValueOnce(null)
+      .mockResolvedValueOnce(null)
+      .mockResolvedValueOnce(adapter);
+    stubSecureWebGpu(requestAdapter as GPU['requestAdapter']);
+
+    await initializeGpu();
+
+    expect(requestAdapter).toHaveBeenNthCalledWith(1, {
+      featureLevel: 'compatibility',
+    });
+    expect(requestAdapter).toHaveBeenNthCalledWith(2, undefined);
+    expect(requestAdapter).toHaveBeenNthCalledWith(3, {
+      featureLevel: 'compatibility',
+      powerPreference: 'high-performance',
+    });
+    expect(adapter.requestDevice).toHaveBeenCalled();
+  });
+
+  it('requests only the core feature when the adapter exposes optional features', async () => {
+    const adapter = createAdapter(['core-features-and-limits', 'timestamp-query']);
+    const requestAdapter = vi.fn().mockResolvedValue(adapter);
+    stubSecureWebGpu(requestAdapter as GPU['requestAdapter']);
+
+    await initializeGpu();
+
+    expect(adapter.requestDevice).toHaveBeenCalledWith({
+      requiredFeatures: ['core-features-and-limits'],
+    });
+  });
+});
diff --git a/src/vibe-uri.test.ts b/src/vibe-uri.test.ts
index fe55d5e..72c04f2 100644
--- a/src/vibe-uri.test.ts
+++ b/src/vibe-uri.test.ts
@@ -11,9 +11,9 @@ describe('vibe URI handling', () => {
     expect(getVibeIdFromUri('https://example.test/?vibe=Aurora%20Mycelium')).toBe(
       VibeId.AuroraMycelium
     );
-    expect(getVibeIdFromUri('https://example.test/?vibe=Velvet%20Observatory%20Copy')).toBe(
-      VibeId.VelvetObservatory
-    );
+    expect(
+      getVibeIdFromUri('https://example.test/?vibe=Velvet%20Observatory%20Copy')
+    ).toBe(VibeId.VelvetObservatory);
   });
 
   it('uses query values before path or hash fallbacks', () => {