Press spacebar to jump.
Use the arrow keys to move.
Press Z to launch a focused attack.
Press X to perform a defensive swipe.
Press C to block.
TIP: You gain mutagen when you attack enemies or when you pick up mutagen canisters. When your gauge is full, press X to unleash a special attack.
If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).