Hey, this is actually entertaining! I like the fact how it's simple, yet a challenging game. Well, not really sure if it was challenging, the only level in which I actually had some difficulty beating was the last one. I think it would be good if you could actually turn this into a full game (well, full flash game, that is, which I don't know if it is considered "full"), as I see this one is experimental. You could add a few more features, make the game graphics a little better, and probably making it a little bit more difficult (adding more levels, different enemies/challenges/etc), but never ruining the game's simplicity. And you could also add some audio to the game, the game gets kind of boring without an appropriate song playing in the background.