Done! The character now has 3 sprite sheets with animations:

1. **teen_idle.png** - 4 frames idle animation (standing, breathing, looking at phone)
2. **teen_walk.png** - 4 frames walking animation (foot movements)
3. **teen_stressed.png** - 4 frames hit/stressed reaction (shocked, cringing, covering face)

The game automatically:
- Plays idle animation when standing still
- Plays walk animation when moving (flips sprite based on direction)
- Plays stressed animation for 0.6s after getting hit by an obstacle

**Next Ideas:**
1. **Add particle effects** - Stress particles flying off when hit, or sweat drops during high stress
2. **Screen shake** - Add camera shake on collision for more impact

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