Use the arrow keys to move left and right. The up arrow initiates a jump. Hit space to fire your weapon. Hold 'Z' to activate your shield. The shield can be used to evade attacks. Be careful as it takes a while for the shield to regenerate after use. While firing your weapon it will become hot. When weapon heat reaches full, your weapon will be disabled. If your weapon overheats you must wait for it to cool to 50% before firing will be enabled again.