The demo features 10 free single player levels (including 2 from the original so you can see the difference!) and 4 multiplayer levels. We have a fairly simplistic random match server that can match players together that may work, or you can host private servers with multiplayer.
See the discussion boards for community content, questions about strategies, etc for each level, or for multiplayer support.
If you like the game, please vote for us on Greenlight!