I had the same idea at first but didn't commit to it, so I'm happy to see a game with this mechanic of counting down each movement. Nothing to say about the execution — graphics are simple but efficient, and SFX are good. Just lacking some background music.
On the gameplay side, while I like some of the ideas (especially the block that switches between wall and not-wall every movement), I think the puzzles are a bit straightforward, and there aren't many ways to optimize the number of movements. But maybe I've played too many puzzle games, and that's not the case for everyone.
Overall, really good game, well done!