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The melancholy of karmic128
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If it helps with figuring out where the header for those special "AtGames/Firecore only" games comes from, it definitely comes from (at least a prototype of) the homebrew game "Mighty Mighty Missile!" for the Genesis. I was able to confirm it by looking at the game's TCRF page: https://tcrf.net/Proto:Mighty_Mighty_Missile!
Really, it's just the fact that "FVRING" is mentioned right there on the game's title screen.
I found another bug with your Genesis Plus GX fork. When you beat level 2 of Plumbing Contest, the game breaks.
Your fork of Genesis Plus GX is able to emulate the dumped D-CAT16 handheld (it's the first emulator that can do so, actually!) however it boots up none of the games. I can tell they're (probably) there, mostly just because the original PCM music is there when you open the file as an uncompressed 8-bit PCM file in Audacity. Maybe you could look into this and see if you could possibly get them to run in the emulator?
Hey, thanks for the shoutout! Yes, that's my reddit account; not sure why I didn't take alexparr though.