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?