What a fantastic idea :DDD and it really is fun to play, to figure out what the world might have looked like ages ago :D
Just sometimes I'm experiencing a bug where the programm seems to think I'm still pressing my mouse button even if I'm not. Then I'm unintentionally spaming blocks everywhere. I don't know where the problem lies, maybe even at my mouse itself. But I haven't experienced it in any other game. So for that it would be nice if the level progress would be resetted when leaving and re-entering it? Or a button to do so.
Keep going :D