what happens when the game is larger than the 450 MB?
If you REALLY need it, your game can get to 550mb, but if you get past the 550 you will not be in the list of winners.
The 450mb limit is here to prevent the game from taking too much space on the computers of the voters, so it's not really a strict rule.
Try to stay within the 450 mb limit though.
also, if you somehow get your game to be bigger than 550mb, you can still submit your game.
It's just that it will not be able to win.
