I don’t like VS code as it keeps up messing things up. ATOM being simple can we use it for unity and c# game development?
I think you will need rather more than Atom for game development.
Based on your interest in Unity my suggestion is install HaXe and then write HaXe code in Atom.
I will comment that VSCode has better extensions for using HaXe but there is no reason why you cannot use Atom as your HaXe development platform. I suggest that you create custom HaXe build and run commands in Atom
process-palette package. These can be bound to toolbar menu items.