Selaco

(PG-13) Powered by the open source Doom engine port ZDoom, Selaco is a first-person shooter that focuses on action set pieces, destructibility, and story. The developers also claim to have smart and dynamic enemy AI, with enemy dialogue that clues you in on how their tactics evolve. If you like F.E.A.R., Quake, or Doom, give this early access title a shot.