by gameboy advance style games I mean games with a more rich color pallete compared to original gameboy games

No, sorry! You can see the rules from last year here: https://itch.io/jam/gbjam-13

I need to update the page with these rules so the explanation is clearer.

There have been a few GBA jams. Try to keep an eye out for them this year, or if you can't see any, host your own!