Hey Jack! Congrats on finishing the jam!
I liked your core design here. The game and story presented itself like a traditional action/adventure game, but it's actually a puzzle game. I like puzzle games! And stringing the levels together like an old-school adventure game really gave the game a nice feel.
The movement collision felt a bit off, especially when trying to get around enemies. I got stuck and pinned by enemies a few times and had to restart which ended up throwing back a few levels. It would have been nice to have some indicator of which gems opened which doors, too. Also, I nearly gave up on the 1st level with an enemy because the health bar was covering the gem I needed to progress. That happened again in a later level, too.
Great work here, thanks for making this :)