Interesting game with a unique art style, but sadly quite a bit buggy!
The main menu was very cool and atmospheric. I think some of the text throughout the game seemed to be using characters that weren't in the font used (possibly exclamation mark?), as I saw "GO" and "GO UP" followed by a lot of boxes with numbers inside. I know the health bar is meant to be a python, but I think it's pretty funny that it looks a lot like an angry Vinesauce mushroom.
It's very hard to tell if I'm hitting something, and I think enemies leave behind lingering hitboxes even after they die, as my character often seemed to take damage out of nowhere. On one occasion I would get damaged and stunned over the exact spot I needed to jump up from, preventing me from progressing.
Some of the platforming after double jump seemed pretty tight, and I was able to make it up a shaft once, but then I died and couldn't get back up there again no matter how hard I tried. On the other hand, the first boss looked pretty cool, and I think it's a pretty neat demo overall!