Hey would you be interested in porting this to Gamemaker 2 or Godot and use a custom engine maybe a DX version. I think you can make a much better game if you do this instead of using GB Studio (as it's limited in freedom). If so let me know, I'll help (could be fun). I've done this sort of thing before. You'll lose GB compatibility, but you can stick to the spec anyway.
(Example in built in about 2.5 hours)
https://2d-knights.itch.io/zledas-adventure-concept