Nice little game. Had fun trying the different puzzles. Some minor things to improve:
- Not sure if it was a problem on my side, but the first time I launched the game the arrow keys were not working. I tried everything. After reloading the page and starting the game again it worked. I have no idea where it came from.
- I would have prefered if the shape moves in the grid instead of free floating. In this way you could have avoided that you sometimes get stuck a bit on the edges.
Besides that, I really liked the game!