Good job :) You can try to add coyote time to platformers and build the level using metrics. Sometimes player has little room to movement or has to go to the beginning of the level to overcome an obstacle if he fell. That's difficult to do on Jam, but if you have more time, it will be great to try these new things.
Thank you for the suggestions! Appreciate it since I'm trying to make this a really solid platformer. I am going to update the game in about a week or so to polish it off. I haven't heard of coyote running before, but I looked it up and seemed like it would really improve the feel and remove so many annoying mistakes during play-through so I'm adding it now. I've also been working on the level design a bit since it was obviously rushed. Making sure enemies aren't anywhere you can't fairly fight them, platforms are evenly spaced out and aren't in the way, and shrinking hit boxes a bit. Learning a lot with this one, its been a great experience!