The phrase "corridor shooter" refers to a video game genre where the player mostly moves through narrow passageways or corridors while fighting enemies. Full definition
However this game is literally just one big corridor shooter, you do the same thing in the first 15 minutes and the last 15 minutes, and I ain't joking. (metacritic.com)
Sadly these brief moments serve only to highlight the frightening linearity of the rest of Colonial Marines, because for the majority of play it's the worst kind of corridor shooter» (wolfsgamingblog.com)