Pretty and clever puzzle game, I could see that expanded with even more brain-busting puzzles!
I also encountered several problems (that others already commented). The character sometimes refuses to come or enter a machine, and for level 5 I don't know what I am doing wrong but I can't seem to pass it. Maybe at least showing the player their wrong answer at the end to help them figure out what they did wrong would also help.
But appart from that, a really charming game. Well done!