For those wondering if Lutellaria would get listed on Steam, here's what the creator said on Ci-en on his latest blog post (roughly translated via Firefox plugin):
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It's certainly not a forward answer, though that's probably just the translation, but I think what he's trying to say here is getting the game put on Steam would delay the development of his next game, because he'd have to update the game heavily to uncensor every single H-Scene, and then add in the other features he thinks of down the line, which on Steam takes quite a while.
Personally, I don't really care that much about a Steam release, I just can't wait for the next update (which will include scenes with the shopkeeper, thank god, and the cleaners.)