Honestly, I'm not a composer either, but I'm trying to make some 8 bit music myself, and I feel it would of taken me quite a bit just to create the music you did. You definitely did really good starting out. I guess I said it was chill because after listening to the music you sent from Youtube, I realized your music lacked the depth and the base it needs to make it sound impactful. Maybe having lower pitched music and a bit of triangle sounds and drums would of definitely improved it a bit more. But like I said, the music was really good seeing your still practicing making music. :D
I definitely felt you there when you couldn't add the ideas you wanted. I wanted the boss to have more attacks and I wanted to properly align my pixels, but I couldn't sadly.
Yeah those ranged attackers and demons would give a bit more of a challenge indeed. Still, you balanced the game really well though.