The return to lobby button does not work. I have notified Nonoba of this and it will hopefully get fixed soon (I can't do anything about it). To return to the lobby you can just close it and re-open it.
After many hours of hard work and frustration I present to you: Shock arena. One of the best multiplayer games around. Here you will be plopped into an arena with up to 4 other people and forced to fight to the death through a series of land grabs, beat downs and backstabs.
If it seems the game is lagging you have 2 options. You can either get a better computer or you can put the quality down. I think most people will chose the latter.
Instructions are in the game but in case you glaze over them: