Games Like Mission: Escape

Mission: Escape is a first-person shooter game.
The main character has one gun.
It is a gun that can shoot and capture the terrain.
Use your gun well and escape safely.

When I opened my eyes, I stand in a strange place. My last memory is of losing consciousness while preparing for a mission. I don't know where we are, but we have a gun, so let's move. I'm sure I can go back.

You become the main character and must rely on one gun to get out of this place.