I really like your idea of using the shake of sprite to let it fly. The action is really intuitive and interesting to play with. I do agree that the direction is a bit confusing, so add a instruction would be great. Also the white out when the bottle hit the ground is a little bit long, so that when the player dies quickly, the only thing they can see is white and it is hard to figure out what happened. Other than this, everything else seems really good, nice work!