Alien Breed 2: Assault

Alien Breed 2: Assault, like Evolution, is an isometric shooter set on board a futuristic spacecraft. In each level, the main character Conrad is given a series of tasks such as collecting key cards, restoring power, or escorting innocents, which he must complete before finding that level's exit. Standing in his way are a variety of aliens who will attack him, usually en masse. He can also suffer damage from explosions, fires, electrical disturbances, and enemy turrets. Conrad can run and shoot in all directions, and can collect a number of different weapons and items to aid him. He can also purchase additional ammunition, items, and upgrades from shops found at computer terminals which also function as save points. The camera angle can be rotated manually in 45 degree increments. Data pads are spread throughout the game, which when collected, reveal information on the various alien species encountered throughout the game and provide back story's for the game's characters. The game features a "survival" mode in which players might survive for as long as they can against waves of aliens while using whatever weapons and items they can find around the area. This mode is available in single-player and co-op modes.

(source Wikipedia)