Thanks! Yeah, we were aiming for "GBA 3d games" vibe, although that went a bit out of control too, and this is the original GameBoy, haha.
Just checked, the project is Godot 4.3. I don't remember the export settings clearly, but I think single-threaded was buggy for some reason, so I had to tinker. The bug was with the viewport, for some reason it was all in GameBoy dark color, and only the opened inventory could be viewed normally atop of it. Well, I wrote two shaders for this jam: one is "palette gameboy-nizer" as a safety measure (the artist made all assets in correct palette, but just in case 3d effects would distort the colors, it'd be converted back), and the second one is transition effect which takes the backbuffer and holds it, so we can have a nice fade-out.
So if I had to guess, one of these two got broken after the initial exports :) The current settings seem to work fine though, at least on the team's machines.