The movement infuriates me - it feels too floaty unless I tap it continually to travel by one tile at a time. I can't even enter through the door.
The buttons could be slightly different in appearance depending if the button opens a door or does something else.
The puzzles seem to be too easy or too tedious to execute like in stage 1-5. The solution is obvious but if you mess up in one place you have to redo all of it again. Maybe it wouldn't be so tedious to do if the movement was better. Or if there was an undo button for the last step at least.
The game is decent. If there were more interesting levels and the movement wasn't as annoying as it is now, I'd gladly play it.