Yes, I would say so. The Retrochallenge is pretty informal and intended to be fun, the only real guideline is that projects should be carried out using something that is over 10 years old, which your Gameboy is by far!
Oh man, I forgot just how big those original GB's were..with the
washed out LED screen..sure changed the way games were
played..Myself, dug the GB pocket, or GB Colour..
A hack I'm thinking of, is to shoe horn the guts from a GB
Advance into GB Color..or original GB...I have enough of 'em
lying around..so I would give it a whirl...
skeletor