i was wondering is it possible to make and submit a .GB ROM file?

Idk. But the only submission is mine and it's a Gameboy rom and it's been left untouched for a while so try it.

But I also think they classify it as cheating because of the second factor

As long as it is original content, yes.

oh cool, i was accually getting into the assembly a while ago and was wanting to do something with it ^-^ (i dout i would be able to finish something, i’ll probbly make like a small shooter)

Is it possible to download GameBoy ROMs from here, save place to do that>?