As of the time of writing, The Gunk is not on Steam. Image & Form’s other games though such as the various games of the SteamWorld franchise are in Steam. So, The Gunk being in Steam is not a farfetched idea. It would probably arrive on the shelves of Steam when the game is finally released for Microsoft Windows. There is also the possibility that The Gunk will not be on Steam but instead will be on the Microsoft Store since it is being developed with the help of Microsoft.