I'm guessing Forgotten Worlds (with spinners) is the only game NOT supported because it needs the extra rotary encoder chip on-board.
Looks like it has 2x 27c322 for gfx so any combination of 2 games that fits in that will be ok, say ffight+sf2 = 2MB+6MB = 8MB (max) = OK. The biggest games, megaman, sfz are 8MB gfx each so would only fit as single game.