Loved the retro style, you really nailed it! The music was simple, but also kind of a vibe and I found myself dancing with the bouncing characters at one point.
At first I found it super confusing, until I found the game page and read the description. I think adding some in game elements to help explain the mechanic/key motivator would've been really nice I feel!
Once I understood everything the coin combat felt surprisingly fun, and I managed to make it through the whole thing deathless :)
Were the various signs around readable? If so I couldn't find a way to read them, and I didnt quite understand what the red things were (but I think they're fire checkpoints right?). Some more feedback on one or both of those things would've improved clarity.
But overall the concept was fun and super solid, and the theme was pulled off excellently!