Awesome little platformer you've made here for a first. Curious if you did the art as well? Works nicely as a browser platformer. I would like to see how the potions end up working once you implement that system in, and I think the idea of having a cold blood lizard needing to keep warm is a cool take on the shadows prompt.
I will say I think this game would benefit from some more secret paths or hidden areas, think it would add some nice variety into it rather than just being a more linear platformer.
Overall though, awesome submission, great job for a first!