Thanks. The main problem with this kind of puzzles is that if you know how to solve it once, you know how to solve it all the time and it gets boring. I based it on a minigame that is featured in many places in mmo game called DDO. The tiles have only 2 states in that game, but there are few size variations.
BTW this game is probably the easiest one to actually implement on the old nokia phones, unlike many other games in the jam, but this wasn't any requirement in the jam.
PS. the game has (at least one) a bug, but fortunatelly most people won't see it, as it can be only repicated when the game is won.