Another decent game designed ruined by the typical mobile developer cancer. I would be happy to spend a few dollars to by this game, but that's not possible. You have to watch ads (often deceptive) for other crappy mobile games after every level, and the first couple dozen levels take only a few seconds to complete, so you're spending more than half your time with ads. Also, the early levels are very boring since you can't fail. It takes a long time before the levels get interesting.