10/10, holy shit this is genuinely amazing, the only complaint I have is the hitbox with the cactus and the stuff in the boss fight, which are easily overlooked with how you managed to put everything besides the secret boss into a real NES game. I actually really like the new boss instead of the mantle boss, does it have a name?
Thank you for your kind words! The new boss does have a name - I had originally planned to reveal it in a series of videos about the fangame's development, but video editing takes a looooong time! I think I'll be writing a large blog post about it sometime, and the reveal will take place there. In the meantime, it's fun seeing what names people make up for the boss!