thank you very much for the kind words! i know the difficulty curve is rapid, i only really focused on making the last level others were just put together in a hurry, there should have been more levels in between to smooth out the difficulty but i couldnt manage to do that in the given time:(
the game definitely needs an undo button, your idea of making the border line is also great! i even thought about it but i dont think i will implement that because some puzzles may use the cornering problem as a key element.
thanks for playing my guy!
(im so happy seeing comments like yours)