Well, necno started it out as a Windows game. I got interested because it used SDL and I could get a native Linux version going.
As for the dev team, it's basically necno, delta224 and myself on the main gaim. Solo looks after the editor, and Dagoth does some work on the UI aspects, as well as providing the forum.
And yeah, having made some solo/long coder efforts myself, it is a lot easier when it's not just you.