wait wait wait, what you mean there´s a week 5 and it´s still not avalaible on steam?
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Due to recent rule changes, adult games can't do the early access/incremental updates thing. So until the game is 100% done with 99% of the bugs fixed, it can't be up on Steam. There's still some Endless and Sandbox mode things to add as well as the Gallery.
Putting the game up on Steam now would mean Steam would get the lesser version of the game.