Your objective in Death Lab is to play as an unnamed soldier freed from an underground prison/evil laboratory by a faceless hacker, you have to escape the facility by using a variety of unusual weaponry to take out every enemy on each stage with a limited amount of ammo.
Headshots will instantly kill an enemy, instead of having to waste valuable bullets plugging away at their health, and many of the levels are unexpectedly thinky when it comes to solving them.