Oh snap, an actual GBC rom? Wasn't expecting that. Wish I had the tools to get this playing on my old game boy.
This was super fun. So many extra little details here, like the way the bullets spawned in time with the music, and the way the blocking sound would rise up with your combo meter -- they're small touches but they're the kind of thing that really elevates the game from a fun little toy project to a solid gameplay experience.