I tried to play it via a flashcard on my Super Game Boy 2. The doors facing towards you aren't visible. Just skip to 45 Min of my stream: https://www.twitch.tv/videos/995585641
I used the latest Rom I found here. To bad I haven't an og Game Boy to try it out.
was it playing it as a game boy color game? The outward facing door is created using color swapping palettes only available through a game boy color, so that may be the issue. I believe that is the issue but I’ll take a look at the twitch vid as soon as I get a chance. Thank you for giving the game a look :)