The market just doubled!!
Count me in that Linux market as well. I love side-scrolling adventure style games, and Aquaria looks to be one I would be proud to add to my collection. The advice of looking into Wine is a good one, but the "real" Linux fanboys will complain about it not being native. I'd prefer native myself, but if it works 100% correctly in Wine, that would certainly be good enough for me. You may also want to look at Transgaming for your port stuff, both to Linux and OSX. They have products to help Windows games run on both platforms, but not without repercussions.
I've many years of Linux gaming experience and in skimming the other messages in this thread it sounds like you might need some help getting off the ground with it. Feel free to email me directly if you need any support. Since you are an admin, you ought to be able to get my address out of my profile, but I'll be watching this thread as well.
I'm excited at the prospect of another (seemingly!) quality title coming to Linux.