In some areas, like the artstyle the animations and most of the Music/Sounds you created a very polished game. But on other parts, like the movement it lacks a litle bit. The jump feels way to poweful and has no real animation and your movement is a litle bit to slow for me.
If you change these things i think you could also even publish your game to steam.
But overall for a game jam game it's really well made.
Keep up the great work guys