Combining the Games seems interesting, but I imagine that, logistically, it would be more difficult to manage and would require a lot of lead time for collaboration, at least four months' worth. Also, I don't think I'd want to be assigned to an artist; I imagine that nothing would dampen an artist's creativity more than being stuck with a collaborator whose fic she couldn't stand (I can just imagine how many people might drop out because of this issue, which would then become a massive pain for you). Writers and artists should pick their partners—and such a collaborative contest would make an intriguing addition if you introduced a third run of the Games. Truth be told, I'd prefer it if the art and fic Games remained separate contests.
Whether the Games are combined or not, I'm all for minimum and maximum word counts because judging a 1000-word fic against a 10,000-word fic seems . . . not quite right or fair to me; short fic and long fic are such different forms. I love fic of all lengths (and with AR vs. AU as a possibility, I might write a really long fic if asked to participate again), but I find it very difficult to keep up with all the postings when there are loads of (however yummy) novel-length fics to read, and I think that to write effective short fic takes a different skill set than it does to write a well-paced novel, so it would be fabulous to see people writing to their strengths in a Games with length divisions. I think that it would be excellent if you decided that all participants had to write, say, a 5000-word fic (or within a specified range of some word count requirement); keeping the word count requirement relatively consistent would make for easier reading and judging—and it might just encourage readers to comment more and on more fics.
The prizes-for-comments idea seems interesting, but it might backfire—eighty bazillion "Nice job!" comments would really become irritating to wade through. Perhaps there could be a requirement that comments should be substantive if you implemented this idea?
As far as posting anonymously is concerned, I don't think I'd like it because being able to immerse myself at once in the works of writers I've found through the Games has always been part of their charm. When I read a lovely fic in an anonymous fest, I review it and tell myself that I'll return to discover the writer's identity at the reveal, but I don't always do that. I can't be the only one. It's an honor to be asked to write for the Games, and part of that honor is the recognition one receives; to take that away might put off participants—and alienate watchers who don't want to take a chance on, say, a fic with "character death" in the warning by an unknown. I'm always more inclined to read through my squicks when I know, or can find out about, a writer.
All that said, I'm amazed and grateful for the Snarry Games; they are the highlights of my fandom year. Thank you and everyone concerned for all your hard work in making them so much fun. ♥