Amazing entry! It's rare for a jam game to have such tight controls, I never felt once that a death I got wasn't my fault, bravo! Even before I saw the description of the game being inspired by Mario and Celeste it was easy to tell, and I mean that in a good way, it's not an easy feat to emulate their movements but you did it! Will admit, got stuck at the part with the chainsaws where you had to mix the tap and hold jumps but that's just purely cause of my lack of skill.
One tip I can think of to give is on the level where you introduce the jumping pads, if you miss to get the jump you don't automatically die but are stuck so you have to go in the spikes to restart. I feel that it would be a better experience to either have the player automatically die in a situation like that or in this case since it's an introduction to a new interactable, to have it stay instead of it disappearing. But yeah, honestly this isn't that big of a gripe, well done :)