This game needs polish, but hell, I HAD FUN!
First of all- the controls could be smoother. The first couple times I died it was because the jump felt weird. But after I got used to the fact I needed to jump first, and steer later, as well as really fast movement speed I started to feel this game.
The colors felt dark, and a bit drab. You can use this tool, to generate interesting color palettes: https://mycolor.space/
The theme? The incoming walls were constantly limiting the playspace, and that affected the gameplay in an interesting way, which is what I think this jam is about!
In the end, the game is ok. With slightly better movement, better graphics, maybe some sound effects, it could be great.
Keep it up, you'll get there :)