Well, that was an interesting game to start my playing time on. I do think it's tuned a bit difficult though, particularly because the jump (intentionally?) doesn't feel great--I might not have finished the boss if there wasn't a convenient (presumably unintentional) piece of collision on the front of Pitmaster's face to stand on, since I could rarely get off a jump on the highest burger before it started falling (and then the jump didn't want to work right when you're falling).
SPOILERS:
It's very ambitious to essentially make two games (in two different engines to boot), even if Disc 2 is relatively simple. I do worry that the adherence to the N64 aesthetic in Disc 1 was hurting it though--I understand things like uninverting the camera and subtitles (especially for "unintended" elements) weren't commonplace, but I would have had no clue what the password was if I was coming at this from a "fresh eye" because it was so blurry, and even then I was worried about the capitalization (though hopefully you accounted for that, or even just let anything in)