This was fun! I liked the effect on the tiles, too. That gave them some depth.
If the hook moved a little faster, you could even start chaining together moves. And it would speed up the pace of the puzzles again. I think a mechanism to look around, too, would be helpful. It was easy to lose track of the keys, so I ended up just trying a bunch of angles to grab it.
I think the music was a little too much for the game. Even when I lowered the volume, it made me a little stressed :D It would be perfect for a boss fight, though!