https://www.youtube.com/watch?v=gzE3f6Mb0A8

My free solo dev project Hellbirther has 4-player local co-op that plays smoothly online through Parsec and shit. Player 1 is the walking tank on kb+m and any other players are drones that connect by pressing Start with any type of gamepad. Every mission and mode works with the co-op. It's quite fun from the little bit of experience I have with it, the co-op drone players can fire a machine gun or missiles or blow themselves up to do a lot of damage and then spawn in again by using up some of Player 1's supplies. Creates an interesting dynamic especially at higher difficulties. Feel free to download latest version from the download link in the YouTube comments/description.