Thanks for playing and I really appreciate your comment!
That's a very interesting bug you found in level 1. I encountered it once where you could jump up the cliff without transmuting the shroom, but I couldn't replicate it. My new approach is scrapping the 2D tile set for 3D ones and going with a capsule collider in lieu of a box for the character. This should make the collision a little less finicky. I think the project is going to evolve more in a metroidvania direction, especially now that I'll have more time to think about things. I hope to add in all sorts of lore and secrets. :)