Ikaruga coming to Steam by way of Steam Greenlight was an unusual sight to behold but if that's weirdly what it takes to get Treasure games on the platform, I'm all for it. In an interview with Famitsu, Treasure president Masato Maegawa said there's indeed plans to port more titles to PC.
"Ikaruga is the first one, and we don't intend on stopping there," he told the publication. "There are some players who say 'How about Radiant Silvergun?' but we also don't intend to only do ports. We're thinking of making a new original title for the platform, Steam."
Chief director Atsutomo Nakagawa commented that "A side-scroller action game might be pretty good..." to which Maegawa responded "Hey! We haven't decided on anything, yet!"