Doesn't the trailer say "Open World Exploration"?
Yeah, and that's a lie. The game is separated into empty levels that all look roughly the same, that are all pretty small and that only consist in killing waves of enemies.
I guess you can explore them if you want but there is nothing to do or see in this game, so why would you? Not to mention that the collision detection on the terrain barely works, so I hope you like phasing through rocks and walls.
At one point, I had to exit the game because an enemy spawned inside the level geometry and couldn't move, and I was unable to reach it. This game is an incompetent mess, and is by far the worst commercial game I have ever played.