I think there should be some kind of 'see how long you can survive' mode for replaying each level. With an enemy that gains difficulty over time. + if you agree.
*goes to quarry, gets only white squares, goes back to 1, goes back to quarry to get 2 more white squares, gives guy 5 white squares, guy colors 2 of them red, then yells at me about it and explodes* 0_0