This game is absolutely delightful but it falls hard into the trap of completely barring progress unless you can solve its puzzles. For most of the game the solutions are easy enough that this is a non-issue but in order to get the true ending the player needs to figure out some particularly tricky puzzles.

When you do figure them out though, it's an incredibly rewarding experience. I recommend having somebody on hand that you can reliably ask for hints because if you get stuck you will be stuck hard.