Wow this was a really good Puzzle Game! A great concept, I really like the idea of going blind/stealth to pass the enemies vision or that they rotate. Reminded me a bit on Zelda Puzzles.
It was very fun to play and some levels really made me think. Good work! I think if you would add some animations for the player & enemies, rework some graphics and extend the game, it could be a full puzzle game! Maybe with some more story?