Re: My key is gone.....
First off, any key from a keygen doesn't work in multiplayer, the key is disabled. Secondly, I wouldn't be surprised if hampa looked up keygens for his own game to dissect them or ban the types of keys they generate. Not to mention he has a list of people who bought the game, so he can check up on who has really bought the game if he had a reason to. Thats one of the good things about small games like these.
In any case, your key would have been banned for some reason and I would talk to hampa about it. Send him a PM.
Edit: And also I noticed that your key isn't entered into your profile. Try that and see what happens.