Done! I've simplified the powerups to only sword (attack) and shield (defense), and increased the spawn frequency from ~1.5-3 seconds to ~0.6-1.2 seconds for more volume.

**Next Ideas:**
1. **Powerup Stacking** - Let players collect multiple swords or shields for enhanced effects
2. **Arena Hazards** - Add spinning blades or bounce pads that spawn with powerups

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