Pretty good. Art, sounds, music and gameplay are all solid. One of the most fun games I played this jam. Theme is present, but is used confusingly in my opinion.
I didn't quite understood the border mechanic. On my first runs, the border was small and moved randomly. When I changed it, only the color swapped or it became stationary, restricting me too much. There wasn't much variety and was a little frustrating. But on my best run I got a wide border that seemed to follow me everywhere and that's when I got stuck playing for almost 10 minutes. But in this case I didn't even wanted to change my border, so you can say that the mechanic kinda turned pointless because it didn't impact my gameplay at all...
With more polish, less floaty movement and a more thought out main mechanic, this game can be a great arcade/leaderboard-focused experience. Congrats!