WWII with aliens. The weapon variety is interesting, allowing you to do cool stuff like shoot around the corner and through walls. Mechanically, it's weird. It's obviously imitating Call of Duty with the WWII setting, the mission structure, and the friendly AI, but in other ways it's very old school. No movement or aiming penalties, so you're free to circle-strafe and kite all you want. You can carry all weapon and grenade types simultaneously. No iron sights generally, but you can click R3 to toggle a zoomed-in view which is incredibly awkward. Health regenerates, but only in 25% chunks, so if you lose more than that, you have to find a healing capsule. Stealth is out of the question, because the enemies don't spawn until you come within range, and they aggro immediately. The enemies take A LOT of damage before going down, and don't seem to respond to getting shot much.