I think Salmon tryed to kill Green with the gun, but he haven't it on but was on the shelf, so Green when heard the gun tryed to escape and Salmon pushed the bookshelf and killed it.
Also he acted to innocently the day after so I think my suspect is him
I think is Teal since was the only one to go there and when knowed that Blue knows (lol) that he is the killer he killed him, also he switched places to go to search people with Tan and this is very suspicious
I think the killer is Spring since he was the only that didn't say nothing when the lights turned off expect for Super_451, but he likes technology and not death and make people suffer soo.... I'm pretty sure is Spring