I wouldn’t say it was designed for multiplayer, just that you can play with other players cooperatively. The game is still solo playable. Yeah, plenty of people still play online AFAIK. I have never played online with anyone other than my friends so I can’t speak for whether matchmaking works or not, but I see posts from online communities looking for players to play with, so its multiplayer scene is still active.

It’s a pretty fun game, I am disappointed that development stopped but we all kinda saw it coming. The game is made in a game engine designed for hunting games, so while the vegetation graphics are very good and the robots behaviour is interesting, it is obviously hard to work with when making a game the engine wasn’t designed for. Plus, it was receiving live active development and free updates and minor paid DLCs for like, 5 years? So it was pretty well taken care of, all things considered.