My highscore is 80
Honestly, I think this is one of the better/best games I've played this jam. It's fast paced simple and fun.
As for advice, I think the 'coin' shouldn't spawn to close to the edge because you can get hit without reaction time, and sometimes it spawns under the ui too. You could 'kill 2 birds with one stone' if you just limit the 'coin' to spawning in a smaller area of the map. Additionally, on a first playthrough i didn't initially realize the colored blocks were just a background, so to give it contrast, you could cover it in a layer of grey, blur it, etc. If you were to take my first piece of advice, then you could reuse the background to mark the coin's spawn area. Besides that, only other thing that comes to mind is making it clear/impactful when you get hit (screenshake, flashing, or more likely just a sound (and if you did ad a sound for colliding with enemies then maybe add one for the coin too) )
I don't think the game fits the theme, but the music is 'groovy' and the game itself is really fun. good job! :-D