Vampyr is fairly moody and atmospheric, slow opening which is a little odd in its ways. Or rather, it drops you into the awakening and basic combat intro, runs you through half an hour of that, then suddenly steps back into actually having choice and consequences and not having to kill everything. You then get story stuff unfolds as everyone you talk to has their own secrets and hidden aspects.
Potentially interesting mechanic on the whole you can kill anyone for their blood, but it will have effects and quests will go missing, etc etc.
Slightly weird that the vampires have to kill to drink blood, they can't just take a few sips and leave people alive.
Also, personal annoyance is that its an autosave slot thing. So if you do want to test the reactivity, you'll have to do everything from the beginning again.
(Well, unless you start copying out the save file and making your own backups outside of the game....)