I think it'd be a good place to branch out into a new market, get new players, more downloads, a bigger community, and even earn some money. I could totally see this being priced at $5-$15, that wouldn't even be an outrageous price for a game of this quality. It would fit in well, too. It's not like Steam bans porn games from its store. 

Honestly could probably charge like $20 (or more) as it's a one time payment unlike Patreon

The game is planned to be released on steam when it reaches the version 1.0 It didn't yet. The developers have own plans before the release, like making more animated art or another playable character. It's hard to tell when it happens. 

Yeah, we have plans to try for a steam release once story mode is playable start to finish.