Done! I've made these improvements:

**Hitbox Fix:**
- Player hitbox is now ~50% width and ~40% height of the sprite, centered on the ship body

**New Upgrades (7 total):**
1. **Weapon** - Upgrades firepower (3 levels)
2. **Force** - Attachable/launchable orb
3. **Speed** - Faster fire rate
4. **Sidekick** - Up to 2 drone companions that follow and shoot
5. **Shield** - 8-second invincibility with pulsing purple shield effect
6. **Laser** - 5-second continuous beam that damages all enemies in its path
7. **Missile** - Homing missile that tracks enemies

**Cool Animations:**
- Upgrade text pops up and fades with particle burst
- Screen flash on pickup
- Powerups bob up/down and spin
- Explosion particles when enemies die (15 particles + flash)
- Shield pulses with dual-ring effect
- Laser beam oscillates with gradient colors
- Missile trails with glowing particles
- Sidekicks hover and follow smoothly
- Enemy hit flash effect

**Next Ideas:**
1. **Boss Battles** - Add massive boss ships with multiple weak points and attack phases
2. **Weapon Combos** - Combine upgrades for special attacks (Shield + Laser = Beam Shield)

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