Don't take it bad for the vote, i tried to be the most objective i could (in my heart that 4's a 6 :D)...
This game has a lot of potential. The idea is simple, as the graphics, and both work perfectly. But, all of this potential needs to be unsleashed:
Add audio FX, Music, more levels, fix up that "only one level" thing and do not obligate to send the scores (make it as an option instead! These kind of things may "scare" players and make them close the game... Bad for "propaganda!").
Fix up this things and more souls than you could imagine will avoid intere afternoons of useful activity to play this game (i'll probably be one of those XD).
Did i already mentioned that it's also goddam addictive?? :)