MoveHold the arrows (or WASD / arrow keys). Stay clear of red blocks and laser lines.
FireTap FIRE for a shot. Hold it until the ring pulses, then release for a beam. Hold at full energy for a screen-clearing blast. (Keys: J, K or X.)
CoinsChain coins to raise your multiplier, up to x5. Taking a hit resets the chain.
Power-upsS shield · T slow time · M coin magnet · ♥ extra life
Waves and bossesEvery wave changes the mix. Every fourth wave a boss arrives: shoot it or outlast it.
Daily challengeEveryone gets the same blocks today. Same seed, so scores compare fairly.
Space pauses on a keyboard. The game also pauses when you leave the app.