I love this idea, and I want to make sure you know that I'm not trying to be a jerk or hypercritical, but multiplayer comes with a set of enormous problems for developers to deal with.
For a bit of context, multiplayer usually requires one of two things: Either a large server so that all players have the option to play together without latency/lag issues, or a built in Local Connection functionality. Both of these can create massive problems for developers, and if Doborog does plan on adding this feature in, it could be a long time in the making.
That being said, though, I really love your idea! owo
Multiplayer would absolutely be the bee's knees, and I think it would be great for players to find out just how much different it is when that enemy is just as smart as they are. XD