Valve launched their new indie game submission system Steam Greenlight just over a week ago, and already we've seen some big changes. Like it or not, Greenlight is already a success, yet its creators aren't about to settle with what they have. Rather, Valve is making it quite clear that they'll continue to evolve the service over time.

Submissions are piling in, both legit and "junk." In order to cut down on some of the clutter and perhaps less serious submissions, Valve added a $100 submission fee to Greenlight earlier this week, along with other updates. Not that the modest fee has curbed interest in the service, and submissions continue to pile in.

UI designer Alden Kroll, a major fixture behind Greenlight, explained that differentiating between submissions is a huge challenge for the team:

Consumer feedback is coming in fast too, and Valve listens to about all of it. As such, Kroll notes that users can expect plenty more changes down the road, across weeks and months.

"We always try to build quick iteration into our process for development of new features, and Greenlight will be no different.

"We have a huge list of suggestions from customers and the lessons we've learned from shipping, so Greenlight will definitely continue to evolve over the next weeks and months as we tune the system and add valuable features."

The process, he thinks, won't take too long, given Valve's inclination toward "non-stealthy" launches. And prospective developers shouldn't hesitate to submit their games just because they don't have an existing community or fanbase for their games. After all, Greenlight is supposed to help with that. Says Kroll:

"Steam Greenlight is as much about building community for your games as it is about getting your game on Steam.

"We're hoping this can be the foundation and/or amplification for bringing visibility to new development projects, and help developers build a fan base that continues wherever they sell their games."