Not a fan of tower defence games... good for what it is though.
Redid the first 5 levels over & over until I finished the challenge & got my card, probably won't play this again.
I agree with Ariad on the level difficulties... 10 was very hard (and relied too much on redundant commands in the functions). I would like to see a game that is more like AI/logic programming, ie, "if this condition occurs then do this" (if you're on a blue square, light it... if there's a box in front of you, jump on it... if there's a wall in front of you, turn...)