Good morning to the Fatshark development team. I’ve played the first Vermintide and loved it. I thought the game was great, ran well, and had cool concepts but the thing that drove a few people away (including myself) was the lack of a multiplayer option. I think you guys have a solid idea and if you were to make an online feature similar to the L4D2 model, your player base would drastically increase. Personally, I think including a multiplayer feature where it’s two teams (4v4 or 5v5) go against each other to see how far people can progress to the end. One team plays the survivors and the others play as the vermin.
I’m aware that my description is completely identical to the L4D2 model and copying it completely could have some legal issues, but I think that example is still useful in demonstrating a good multiplayer system (and if necessary you guys could easily change a few things to avoid legal issues) . To me the multiplayer feature will make this game explode and give you a good player base to work with.
One last thing, I’m aware that creating an online multiplayer feature will take a lot of time, and will require many resources to achieve it. I think it is worth investing in because it will allow the Vermintide franchise to grow with every game you develop in the future, and it will keep players interested in your game.