Heya! This game is available on the Lexaloffle BBS, where I believe you'd be able to get the .png which can be opened in the Pico-8 editor. You should be able to find a few other games there as well.
Thanks for the info. The only other cart I wanted was for GOLDACHE, but that doesn't seem to be in the Lexaloffle archive. Any chance you could upload that one?
I'll try to get that up at some point, sure! Can't promise a timetable unfortunately but I'll make a note to circle back here and reply when it does happen.