Why are homebrew games not okay? Licenced roms I understand but homebrew games for obsolete systems are just hobby projects mainly.
The only ones I'm familiar with are Super Bat Puncher and D-Pad Hero. D-Pad Hero is a demake of guitar hero if you're into that kind of thing, and Super Bat Puncher is only a demo but it's REALLY impressive as an original homebrew game, and definitely should be checked out.