I managed to beat the boss :)
The gameplay feels solid overall, but I think there might be a small bug when jumping to the left while running. Jumping to the right works fine, but to jump to the left I have to release the movement key first before I can jump. Aside from that, it handles well and is easy to get into.
I sometimes had trouble seeing my cursor because there’s a lot happening on screen, maybe replacing it with a more visible sprite could help.
As for the sound design, I really liked it and found it very fitting. Nice little game