A Rogue-like-like First Person Shooter styled after the over-the-top 3d shooters from the mid-1990s.
The Gun Turret is a common enemy in Bloodcrusher 2. They don't have much health, but they come with armour by default, so they are a good argument for having an acid or shock based weapon in your inventory as early as possible. They are stationary, but some enemies may drop them.
Gun Turrets come in four varieties; shotgun, gatling gun, rocket launcher, and beam gun, and drop those respective weapons on death. Though obviously they don't move around, they are more aggressive with shooting than most of their fleshy comrades.