Nice game. I always enjoy these semi-quick simplistic games. I would like to ask if you considered adding a gameover/win image for collecting all 22? Mostly I play these games because of my obsession with collecting and achieving a goal, so it would be a lot more fun to have that and a good end to a short game.
Also, you should consider making more of these kind of games, it is definitely a lot more fun than some of the random fan games on here.