Hello.
What I like:
-The music. Geez, that music is awesome.
What I think could be better:
-The camera. You can't see what's ahead of you and taking damage to an enemy that appeard 0,5 seconds ago feelsbadman. Since you are using Unity, you probably are also using Cinemachine. If so, mess with the damping ( x and y ) and look ahead time.
-The player animation. The player animation is too fast for such a slow character.
-Full-screen mode. Did you disable it? I really like it, since this is a WebGL build. Please consider adding it to your future games.