Does anyone know Space Station 13? I never played it really since I have no time to learn all the stuff but I watched some stuff on youtube. and thought it was very interesting. Well I didn't want to recommend that one but this: Barotrauma.
A 2D co-op online multiplayer drowning simulator. :D
It's inspired from SS13 but far less complex. Good for casual dudes like myself. There are a few roles like Engineer or Mechanic and everyone has his/her role to fulfil. It has also a traitor mode. There's an alpha version to test out for free. Steam early access release is in Q1 2019. Well I thought it's pretty fun but you need friends since griefers and trolls on public servers are a thing. :/