1) PC
2) Depends on the era/side you will choose, but a big one would be uncertainty, or enemy AI "fuzzyness" so that you can't just learn a way to escape and then repeat it all the time while sipping coffee.
Also, a particular graphic identity. Not necessarily ultra-detailed 3D stuff, but something "clean" and catchy, I think this can be compatible with tight budget and short dev time.
3) 1st person (sub commander or 1st WO)
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