Void War is about making starships, lasers, and powered exoskeletons fight against necromancers, occult magic, and demonic summoning. It's a universe that goes way over-the-top in mixing dark fantasy/sci-fi themes together and seeing what comes out. Dark magic ritual sacrifice. Expendable cyborg meat slaves. Arcane starship modules that make all non-lethal spells lethal using the power of hate. That sort of thing. It's so dark it's silly, and that's what makes it fun.
This has a lot of implications for gameplay, but one of the big ones is an extremely fleshed out crew combat system. Over 70+ unique crew types, 140+ wargear options for outfitting your crew, consumable equipment, psychic powers, customizable commander units, and more.
I wrote more about it here: https://www.reddit.com/r/ftlgame/comments/1f8ysvz/comment/llhugr3
Our initial teaser trailer doesn't communicate this stuff very well unfortunately. We will be posting a new, more in-depth trailer very soon.