Wow. If this popped up in my feed, I wouldn't be able to tell it's a game jam game. No notes.
High-quality sprites, animations, background flair, scene transitions, music, and SFX. Even the controls themselves are intentionally hobbled just a bit so that you're not going to be able to reliably jump over every enemy or move and shoot at the same time. This puts up some real consequences if you are low on health and decide to go for the ruby anyway. Level up options are meaningful but not game-breaking. Health refills come at the cost of a forgone upgrade. Just really great tension and balance all around.
Masterfully done, y'all!