I guess I was slightly put off by the whole game monetization and offers to play ads to skip this level, I mean it's fine to try and make money off a game, but a jam is really just for the fun of it, and people will play your entry to try and offer advice and sense of community so trying to monetize that good will feels a little off.
That said there are some promising signs... it looks good if dark, but it;s an aesthetic I quite dig, I am note sure if any of the sprite/ art work is yours or if you just did coding... but either way with so many external assets you have made something that feel cohesive.
I'd suggest trying to up the speed a bit, as others have said it does feel sluggish... leave annoying precise jumps till a little later or at least don't make them result in insta death. I am not one to talk as movement in my games is always pretty bad... but really focus on getting a character that feels fun to move/jump attack, and then you can focus on adding some metroidvania ability gating.
Sorry if the above was a little negative but hopefully constructive - but you are on the right track, and I would be interested to see future games you come up with