Uhh... Sorry to say this to you Oddpress, but this game isn't running on a Game Boy or GBA emulator. This game was made on TIC-80, a fantasy console designed for both low-end and high-end PCs. It mimics the limitations of old 1980's home computers and consoles, with some additional perks like scaling, rotations, widescreen a custom cursor, changeable palettes, and primitive 3D. Basically a "high-tech" version of Pico-8. So making a .gbc or .gba rom for this game may be impossible, since it was not desighed as a console game, but rather as a desktop game and a web game for computers with an actual OS. If you want to try this game in a handheld, however, maybe try installing the Linux version on your handheld as a standalone game and configure your key mappings to the buttons on your handheld for a playable experience. I don't know if it works on your handheld though, but my Linux handheld is a PowKiddy Q90, and it somehow supports games to be installed directly on the OS, without depending on Wine emulators or something like that. (It even has some of them installed!) But I know this isn't true to most Linux handhelds.