That's an impressive collection of Indie games. This looks like the classic example of a consultant gig. You have some specialized knowledge of how to solve a problem that's easy when you know what you're doing. Indie devs can hire you for a day and check off that "Linux support" box so they can show up in a Humble Bundle and make a little more than you spent on the consultant with those 5% or so Linux gamers.
I wouldn't have thought linux games were such a small thing, for a single person to have worked on so many of them