This was copied from comment I made on Youtube.
I have a theory that [Mario World 64] was made by the
Peruvian scene organization Twin Eagles Group,
instead of Gamtec as most people appear to
believe. Here's why:
1. They already made a "Sonic on SNES" game,
which is a hack of a Speedy Gonzales game. At
the end it says "Sonic loves Nintendo, Mario
loves Sega." This could be based on the same
joke.
2. Instead of opening with a logo, it opens with a
photo of Mario, similar to how Ronaldinho Super
Soccer 64 opens with a photo of Ronaldo.
3. The music is mostly stolen from Disney
games, and a lot (not all) of TEG games are
based off Disney movies.
4. Yoshi is not so well photoshopped out of the
title screen. TEG's 16-bit hacks are usually a bit
scuffed.
5. The sound that was not stolen sounds similar
to TEG's music.
The main proof I have is that this could be a
follow-up of Sonic 4.

Nope, because it runs on VT03, which has an expanded color palette.

Well, I suppose it may be possible, if the mapper was rewritten and the images were converted to the NES palette at 2bpp, but it would be difficult.

Does anyone have access to the rom of Fishing by Nice Code? Apparently it’s dumped, but I can’t find it anywhere online. Does anyone know where I can download it?