The fix applies three improvements:

1. **Sub-stepping**: Movement is split into multiple small steps based on velocity, so fast-moving players can't tunnel through objects
2. **Multi-iteration collision**: Each collision check runs 3 iterations to resolve overlapping cases where the player gets pushed into another shape
3. **Separation buffer + directional checks**: Collisions now add a small gap (0.002-0.003) when pushing the player out, and only reflect velocity if actually moving toward the object (prevents double-bounce glitches)

**Next Ideas:**
1. **Visual bounce feedback** - Add a brief squish/stretch animation and particle burst when the person bounces off objects
2. **Trajectory preview** - Show a faint dotted line predicting where the person will bounce next

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