I made some things I've never done before, I made:
-puzzles that plays out like those "rock pushing puzzles" you would see in a few caves in Pokemon (and making some puzzles were a lot trickier than expected for designing),
-having the ability to switch to one of the 2 different levels you can go to at the end of a maze
-multiple endings
There are probably a few more that I'm forgetting but at the end it was pretty tough to get this done and I'm glad I somehow managed to get through most of it :)