The explanation of tests is in the Intro section, but probably could have been clearer. In version 2, I'm putting in an expanded section on stats and tests as well as redoing unit creation.
The injury system and the bonus for lowering your stats was meant to fit the theme. Some of the abilities are able to hit your own units and I had hoped the bonuses for lowering your stats would make for interesting choices when you take a hit. But I do agree it is kind of weak. In v2, I'm dropping injury bonuses and going with a team-wide Morale/Underdog track.
I was going for a space opera setting, but decided to cut the flavor text.
For v2, I'm adding in different alien species more customization for the units. I'll probably also have some sort of team structure to ensure the 8 runners scenario isn't a problem.
Thanks for the feedback.