[x] Ash Farms: Emerald believes that with some help from your geneticists she might be able to turn the Ash fields into something useful.
[x] Send a unit to scout (Can use any available units but some are better then others.)
-[X] Explorer
-[X] Soldier scouts in opposite direction of Explorer, but only expand know distance by 1-2 tiles maximum, staying nearby city.
[x] Set your colony to produce either a unit or a building.
-[X] Defensive Turrets
[x] Add an improvement to one of your tiles. (Requires an available worker for each tile you plan to improve.)
-[X] Farm
Personally I think Unity is our best option for what Affinity to aim for given our enviroment. The fact that we're all alone on an alien world means people need to stick together for survival, and few things can unite people like a shared opponent.
As for the canon affinities, Purity would for us likely forego "Humanity, Fuck Yeah!" and center on the idea of "Planet Earth=Badass". Supremacy on the other hand would, given the outright public acknowledgment of the existence of the supernatural, could go down a path of Magitek and Technopathy/Technomancy. Of course this is all just speculation.
Edit: For in setting questions, what is the rough ratio of Humans/Youkai in the population, what kinds of Youkai are present, what is the current public opinion, and the current state of Human-Youkai Relations.
Edit#2: Are you going to be using anything like a simple hex grid to map out areas, or are we going to be just using an abstraction via descriptions?