I don't usually play solo rpgs, I don't see the point in it. However, I sometimes run solo to test out the mechanics and how a system flows.
So I chose a xeno and run some simple scenarios in my mind. Some sneaking around, some combat. I really like how powerful the more straight forward xenos like Knife and Meat feel. In a straight forward fight, they dispatch 5 goons per turn on average. Bone is very well thought out utility role and bonus points for being extremely gruesome. Gravity is limited in its damage output by the mechanics but its x ability is insanely overpowered.
I must ask: was Manhunt from Hull Breach volume 1 for Mothership part of the inspiration? The xenos are quite similar to the monsters in it. I like the xenos a bit more though.