a / left arrow = move left d / right arrow = move right w / up arrow / space = fly s / down arrow = move down z = attack (during boss battles only) (Do not mash the button, just let the projectile disappear before firing another one.) Collect balloons to eventually buy things in the shop. This is actually required to progress through the game. If you lose, click the green flag button twice. Do not, for any reason, click the shop button during a boss battle. The game (probably) looks better in full screen. If when you defeat a boss and nothing else seems to happen, then keep attacking, because either their health isn't low enough, or they simply have to finish their pattern before being defeated. However, a couple of bosses seem to behave oddly, so here is how to deal with them: Boss 3 - keep attacking, but allow its spinning projectile to leave the screen after the boss' health is depleted. Boss - 4 keep attacking, but allow it to bite you after its health is depleted (yes, you will lose a life, so buy at least one extra life before getting to the 4th boss.)
