Good puzzle games involve thinking. This one doesn't. In the later levels it's just about being pixel perfect. When people actually view the walkthrough and still can't beat the level, then you know something's wrong with the game.
This game is like chess. It encompasses the idea of maximising efficiency with every single piece such that they work together in tandem to achieve a win in the best and fastest possible way. In particular, positioning is super important in the later levels. It lets you do things you wouldn't have imagined was possible :)