Not like I'm an expert but from what I've seen over the years, devs generally start off the games as a hobby of sorts that they do on the side while they have their separate primary job irl.
Steam release of their game, they tend to use it as their jumping off point to evolve their initial hobby to be actually go into their game development fulltime.
I could be wrong, but if Zetan is going fulltime with Steam release, it can only mean good things for us fans with him working even harder at the game (not saying he didn't work hard before, but he'd have more time to work on the game than he did if previously he did it as a hobby).
But even if he doesn't go full time?
I don't really consider it as a loss, given Zetan has been very consistent in terms of releases with this game from the beginning till now.
So I don't really see that much of an issue with the Steam release.
It's basically something which pretty much almost every even moderately successful game goes through.