this was interesting to read and i do agree with a lot of what u said about the difficulty of rating music. ur point abt how certain pieces may not sound good themselves but might be fitting in the context of a hypothetical game is something i hadnt even thought abt but it makes sense.
i think the idea of having an actual game that we all make music around is a great idea but itll definitely be harder to organize than just a visual or verbal theme like u said