And any cheap Chinese retro-console of the same sort support even more of them. So from a practical standpoint I don't see any advantage of this (no doubt cool) project.
The FPGA cores here are written from scratch by me with hardware support in mind, and it’s quite a bit of work! Plus, SNES cartridges don’t exactly fit in a handheld :)
Surely, you've heard of the Supaboy.
I jest, this project looks great! After looking over the build instructions, it seems like this might be a good reason to finally make an account with JLCPCB.
Portable FPGA retro console would be great.
I realize you don't have the resolution needed for such a thing on your project, but it would be interesting to see a full SGB setup via FPGA.