Insanely repetitive with no narrative context to add any excitement. All it does is putting you in a locked room where all the enemies continuously keep spawning, and just having you mindlessly blast away with whatever weapon you have in your hand until the doors arbitrarily choose to open once they're all dead. When that's finally over with, you just run through linear paths and corridors until getting to the next enclosed room just to repeat the whole process of fighting the exact same enemies all over again. This is not strategic!