if ya'll are wondering what happen to Zim and the game an etc. look here: Time to Evolve | Patreon
That may or may not be true, however I believe Zim, the owner of the project, wanted to work on this game himself, since it is his ideas that made this game come to life, you know? If I made something, I'd want to finish the job myself, but it seems like he didn't have a choice or something from what I've read.