Well I did enjoy it, but it really doesn't fit as a pc game as these kind of games aren't the ones that you come looking for later to play again (ofcourse it's different on the mobile devices). If you're planning to continue with this game to be played on Newgrounds, you could try to add more stuff. Archievements, upgrades, etc. that kinda stuff increases the play time.
As for mobile devices, I'd like to see this game on Meego for I have N900 and I'd like to play this on it.
Anyway, good job. This is a fine example of a simple but still a very nice game.