Help -- shows the list of commands if you'd rather see them all in-game.

Wins -- shows how many levels each player has completed.

Kills -- shows how many times each player has killed the others.

Deaths -- shows how many times each player has died.

Kick Username -- kicks the player with whatever username is typed.

Password -- if typed alone, removes the password from a locked room.

Password Apple -- would set the password as the word Apple. Replace Apple with whatever you want the password to be.

And that's it for commands. Or, at least, the ones listed by Help.

Since it's not in an obvious location and I see tons of comments on the developer's Steam page regarding it, I figured I'd include this as well since it's online-related. The update last night (June 18th/19th 2015) added this option. The below list of steps only needs to be followed by the host.

• Select the Host menu and set up your game however you like, password and all.
  
  
• Once the game is loaded and waiting for friends to join, pause the game and select Options. Then, change "Allow high latency" option to Yes.

Presto! You should be good to go. But, your friends with awful pings may have an extremely laggy experience.