Shoot The Ponies
This game goes on forever. It's a bit one-sided. The ponies need some way of threatening the launchpad or even the missile. Perhaps they could drop bombs at random points as they fly past. There could be a limit on the number of missiles and some sort of level goal, like having to kill a certain number of ponies. Maybe the whole game needs to be reconceived as a Space Invaders clone. Whatever you think, here's the source code, pony_darts.fla (227 KB).