Honestly remaking CM on another engine would only be worth it if we remake it in 3D. BYOND is good enough for 2D clunky shooting, plus there's the SS13 hub bringing players to the server.

I guess the question is, why port a game whose features are largely derivative from the limits imposed by it's shitty engine to a good (compared to BYOND) engine? A Unity CM would, in the very least, have to be a 3D enviroment with a fixed top-down camera to be worth it.