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Glad everyone is enjoying the game.

We definitely have a referral system in the works and like Tobith said, it is one of our top priorities. I don't want to go into too much detail since it may change, but currently we are thinking about giving players credits for referring players that reach a certain level and/or donate. Our goal is to give players a way to benefit from referrals without allowing cheaters to take advantage of the system. When we know more we'll let everyone know.