Not sure whether this is confusing or amusing.

This is a flash browser game. So, would a "Steam version" just... launch your browser of choice and load up a web page? In that case, how would it be in any way, shape, or form different than right now? You'd just be using Steam as a glorified URL link. With the added benefit (?) of letting everyone on your friends list know that you're watching girls based on flowers fuck. And stab bugs. (Though thankfully, not fuck bugs.)

No, that would be pointless. It would have to be something more standalone. A downloadable, dedicated game, which Steam would then launch. But... Who's gonna MAKE that? With what time and money? We can barely even get them to implement changes that the original DMM version has already, and its been pretty clear that DMM won't even create new assets (new girls etc) solely for us. So how the heck could we convince DMM to greenlight an entire new version of the game?

Okay, let's assume someone flew over to DMM headquarters, got them all drunk, signed all the necessary paperwork, and fled before they sic'd the Trump Pest on him. And magically created the new version, while we're dreaming. Yippee, we have two English versions of Flower Knight Girl. Now what? What do we gain? What does anyone gain? Because I'll tell you, I don't see any gains.

I do see losses, however. Losses associated with creating a functionally-identical product for the same marketbase. Nutaku would never do that, it's horrible business. The only way would be if a new company got licensed to operate on Steam... and Nutaku would NOT like that one bit, as that's directly cutting into their market share and profits.

So, really, the Steam version would have to be:
* Hosted by Nutaku
* Requiring no new investment or development
* Identical to the current Nutaku version

In that case, rejoice! Your wish has already been granted! It's a little hidden, though, so I can't blame you for not finding out how to play the "Steam version" of Flower Knight Girl. Just add Firefox (or Chrome, or etc) as a "Non-Steam Game" in your Steam library. You can probably tweak things so that the game name shows up as "Flower Knight Girl", too. Bam, done.