Some bugs I found: when a player joins a game with other people already playing, they spawn at the bottom where the water is still filling at a certain point, also when a person dies, they respawn at the bottom, literally making them unable to play. also the water doesn't show at all when in multiplayer, but in solo, it shows up.
 
another bug I found: in some circumstances, when players do randomly spawn back near the other players, plutonium crashes, which never has happened to me before..