it shouldnt be black and white, check rules again please
While the page art and thumbnail are in black and white, the game itself complies with the limitations of the Nokia 3310 jam c:
idk if its allowed but ok
Maybe try at least loading the game before acting like the game jam police. If you did you'd see it's not black and white. They can do whatever they want with the project page.
i know the game uses the right palette, i dont know if it is allowed though