The Next wrote: "Steam is a free system they could get an account easily enough, there will be a free player system developed in future that will allow users to play multiplayer maps without a copy of GameGuru and without the game being published on Steam."
For the moment (I don't known for what reasons) on the "Standalone games" section
doesn't included this "stand alone multiplayer" https://www.game-guru.com/feature-vote
P.S. In my opinion, the "multiplayer via Steam" it's not a good option,
because if it's now your own game after you buy it the software from the GG!
So, who want to play his game just (free or sell) alone if the buyer's can't free (or sell) his game as "stand alone multiplayer" ?!?
...maybe just as a hobby, not for making money.
Smile today, tomorrow could be worse
"The best forum, game software, operating system or web platform, it's that software which can give you most of the features and speed, not just amazing graphics."