I found this surprisingly meditative, good job! Some quick notes:
- Snapping blocks would have been a great addition
- I start piling blocks on the board to "save" them so I could see what pieces I was working with. There wasn't really a downside to this that I could see
- My pieces kept getting stuck since I could only bring them from the right side
- Being able to choose a time limit would have been nice! I think 2 - 5 minutes for a game like this would work well otherwise players may not stick around to the end.