The cheats are mainly there for testing development and mods.
Cheats are enabled via the /cheat command. Press t to chat then run /cheat. The /cheat command requires the DLC to have been purchased first.
After they are enabled using /cheats press F1 to do god mode. God mode is a bit buggy on clients because your stats will be out of sync with the server.
0-6 to skip to levels. Level 6 is the victory screen. Level 0 is the lobby.
Page up/down to test room designs. Hold shift to skip several at a time. After testing a room design the entire level will be broken since the doors are not connected to the rest of the level.
You can click on any item in the stats menu to gain it.