This is a very clever and fun game! I completed all the levels and all of them were unique in different ways which is sometimes hard to do in a puzzle game. However I noticed that despite w, a, s, d keys work properly arrow keys don't (but sometimes they do). And also if you press two movement keys simultaneously you can move diagonally thus painting one cell instead of two, and I wonder if that was intentional or is it a bug?
Viewing post in glatiles jam comments
fixed, you can see the update changes here https://mantevian.itch.io/glatiles/devlog/409759/update-11