As Zuul mentions, the main problem is that Google Checkout does not support developers from Scandinavia. If/when Google get their act together and open up the market to support more nations, I will look into the possibilities of developing a paid version of the game. The premium features would probably be limited if I did something like that - I am not a big fan of "crippled" free game versions. Additional starting ship choices or similar is a nice idea, though.