To me, the levels should be:
* Paltinum - the game works as well as it does on officially supported platforms
* Gold - the game works almost as well as on supported platforms but with minor niggles that don't significantly affect the experience
* Bronze - the game works in some form, but major things might be broken. It would not ship in this state on official platforms.
However, the project is a great start and I look forward to what they do next!