I played level 3 more than 10 times till I realized my brother was right: I am a noob. Still I finished it to find out that there was no level 4 :(
The idea of using the theme in a visual manner is really amusing and I totally dig the minimalistic art-style of the game. I think it would be interesting to use the fact that they are number as part of the game mechanics. Maybe, the player can push other numbers into some mathematical operations till all the numbers in the level are only 1. Despite the little collision bugs, it was fun to play.