I love this game. And it would be awesome if the Steam version got profile customisations (profile background, mini profile background etc.)
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I can't add any Steam trading cards or backgrounds until the game earns a certain amount of money in Steam sales, and the game is very far from hitting that earnings threshold. With the way curent sales are, I wouldn't be surprised if it took 4 or 5 years until it made enough money to be eligible for profile customisations.