A/D or Arrow Keys: Move left/right
Space or Up Arrow: Jump
J: Punch attack
H: Lightning strike (charges from punches, kills nearest enemy)
S: Open shop
Escape: Pause
Toggle blood particle effects on/off
Adjust the number of blood particles (1-50)
Toggle screen shake effects on/off
Double attack, speed, and max health — but you start at half health.
3x more enemies per round.
Increase punch damage by +5 points
Boost movement speed by +10%
Increase maximum health by +20 HP