Nice! like the idea, but...

1) too much to fight and too less to calculate ... especially where the math correcting gives you not enough points to be worthwile
2) picking up numbers works inaccurate - this is the most creative part, so correct the handling and make it more needful to solve the level (see. 1)
3) how do the exercice towers work / functional? btw: you can walk through them if you're inside
4) if the time is up, even if I solved the level, the following levels are always only includes "3" on the blocks ... seems like a bug ... also sometimes the movement is freezed

go on and best of luck for the contest