The game isn't moving to steam, Arc has stated multiple times he's not and can't move to steam. Mainly cus the modded kk assets but also because of Steams updated ToS against adult games.
Viewing post in Corrupted Kingdoms (NSFW 18+) comments
Huh... Well thanks for the info, I hope that these users on this webpage stop shitting on him because the remake version of corrupted kingdoms is trying to test new models and ideas for the old version of the game or they want to switch over to a different game engine to make updating and new possible updates without bottlenecks, so guys can we stop shitting on this person just because they revealed a demo for this game to see if anyone like the changes or they should go back to the old version that they use to make this game.
P.S (this is my opinion about the situation so don't use my opinion for justification to fucking attack him probably he's dealing with something personal in his life or something financial I'd rather not push it)