It's a decent lightweight system. I don't think the mechanics are rooted in any particular theme (it really might as well be a generic system), but it's pretty cool.
Thanks :) You're right, the system itself is quite generic. I've tried to build a sense of the world through which skills are available, for example Surfaceology and Survivalism hints that you may sometimes have to venture to the surface. In retrospect I should perhaps have worked on this more!
