Quirky and entertaining.
It would go so hard with the addition of SFX and Particles I bet.
Very unique playstyle too.
Only gripe with the mechanics is that I feel like I lose control too much at high speeds, and slowing down at that point feels futile.
Make the jump a bit higher and perhaps add a way to brake (I think would be good).
My recommendation with tight deadlines/game-jams is to have placeholder sounds in place as soon as possible
(like the moment you have coded a jump, add a jumping sound) because I also understand that doing everything solo is a lot of work, making sounds often come last in line.
Keep it up.