I see. I understand.
Well, one thing I could suggest if you were to develop the game with the same restrictions is use the lock door and key instead of the regular door and button for the one time door opening part. (I used the same asset pack, so I did see two types of locked doors)
One might think it's strange that a heart could collect a key and automatically open the door. But hey, if the character can teleport to the heart's position, surely anything is possible.
This is just a thought, though. Still a lovely game. (No pun-intended ... I think)