I've created **Rhythm Rush** - a fast-paced rhythm platformer! 

Open `index.html` in your browser to play. The game features:

✨ **Core Mechanics:**
- Auto-scrolling level with constant forward movement
- One-button control (SPACE, click, or tap)
- Cube player with jump physics and gravity
- Instant death and restart on collision

🎮 **Gameplay:**
- Beat-synced background pulse (visual rhythm feedback)
- Multiple obstacle types: ground spikes, walls, ceiling spikes
- Distance tracking with local high score
- Smooth particle effects and glowing trails

🎵 **Rhythm Elements:**
- Background beat that pulses the screen
- Jump sound effects
- Death sound effect
- Obstacles spawn at rhythmic intervals

🎨 **Visual Polish:**
- Neon cyberpunk aesthetic with gradients
- Particle trail system following the player
- Rotation animation while jumping
- Glowing effects on all elements
- Smooth collision detection

**Next Ideas:**
1. **Ship Mode Portal** - Add a portal that transforms your cube into a flying ship with continuous flight physics and tighter vertical control
2. **Custom Level Editor** - Build a simple JSON-based level designer where you can place obstacles to the beat and share level codes with friends

**Ready to level up your game? Pick one and let's build it!**