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I was having the same issue, and then finally figured out that you have to play through 'Classic' and not 'Challenge'... You can add more players and change the AI to player(s) 2/3/4 etc., but only in 'Classic'.
To invite friends to play with you (this needs to be done before you begin a 'Classic' game in the game), press 'SHIFT' and 'TAB' at the same time to get the Steam Overlay up, then invite the specific person/people to play with you. They will need to have access to use the same mouse (so they can control your mouse while you're playing, but that's how it's meant to be unless the developers update the game). You can give the other player(s) access by clicking on the mouse button under their name(s). Once they've accepted and you're ready to go, just press 'SHIFT' and 'TAB' again to close the Steam Overlay and get back to the game and begin playing together.
Hope that helps!