Really like the puzzles, and the art (both music, sfx and 2d art) is really polished and nice!
A couple of notes, on level 7 it isn't really clear why you have to make the circle first on the left side and then the right one. On level 10 it crashed for me, when making a circle starting from the red square, restarting doesnt work and neither does any UI button, but having the ability to skip levels allowed me to continue after restarting.
Overall really nice game, congrats!