That’s a funny idea, a visual novel for the Game Boy Advance. This reminds of Doki Doki Literature Club and I guess that was the point.
I sort of guess that the members of the club are supposed to represent the different components of a Game Boy Advance, with Nyra being the ROM, Tooru being the graphics processing unit, while Yuuji seems to be either CPU. So far, I don’t see any member that could take a role as a sound processor (or maybe it’s on purpose)
It’s an interesting project, and I look forward to its developmeent. Good luck!