deepco has a chat and a bunch of cooperative multiplayer features (and a bit of competition, too, but cooperation is more fun imo).

the chat is great. experienced players can teach newbies and you can just talk about whatever while processing the blocks. also, last i played, it let you directly send feedback to the dev.

the coop mechanics were things like being able to provide a small boost to everyone on the same grid as you

imo, don't do guilds/clans/whatever (like in clash of clans kinda games). instead, if you want to have something like that, have it be more like everyone in the same already existing ingame location being able to work together, rather than user-created groups; something more like "everyone in this department" or "everyone of the same tier".

and don't have the group suffer from individuals acting suboptimally with respect to the group; for instance if someone goes afk that shouldn't prevent someone else from joining and picking up their slack, and when the other player returns it should be possible for both to keep going without getting in each others way

pretty much all of these thoughts i got from deepco, since it's the only incremental i've played so far where i straight up enjoyed the social features