I know you said you weren't happy with the pixel art, but I like it! That's something you'll only get better at the more you do it. Strangely enough, there were some parts of the game that reminded me of Yume Nikki which, intentional or not, is pretty fitting for the theme of the game jam. There's a lot here to be proud of!
The jump/double jump both feel a bit inconsistent, which is understandable (platformer controls can be a real pain in the ass lol). Things like input buffering and coyote time might be worth looking into if you're interested in making more 2D platformers.