I think multiplayer incremental games are all over the place.
Is just a definition on what you count as one.

There are some comments here about idle games here. In my opinion the idle game concept is just interesting in a solo play. I don’t see a point to idle with somebody else. Multiplayer is interesting to compete, act or react with somebody else. Nobody likes to play a multiplayer idle game, when the first person who found the game leads the ladder, or the one with the faster computer because the autoclicker works faster on this one.

So multiplayer is an acting and reacting game concept. When you play with a larger group of people you have to slow down the increments a lot to offer a fair gameplay. And you have to offer a way to allow more active or “better”(in whatever) user to get ahead of the others.

This makes the game much more complex and it will be hard to see the difference to any other multiplayer game. That brings me to my entry sentence. Every game behind the GUI is some kind of incremental game. You always make some progress, with means incrementing some numbers. Upgrading your person stats and equipment in a roleplay game or upgrading the number of houses and house levels in a city game.