Nice game! Platforming was smooth, puzzles were solid with good progression. I tried to solve a lot of the puzzles by following my interpretation of the rule "Last button used", for example firing an arrow and pressing left so that button would go instead, but found that it would still get rid of the arrow. Or pressing left after a jump, but the jump would still disappear. I'm not sure if that was intentional or not but I think it's be more interesting if that was possible!
Also great ending! I use game maker too so it made me panic for a sec haha