Fun game, but frustratingly uninformative about it's controls. WASD and mouse to aim/shoot I discovered. No idea what "bricks" means!
I like how the scenery is destructable. And how the rat population grows over time. I like how the rats are initially indifferent or run away, but in bigger groups they chase you. I like the pickups that contain ammo and health. I like that the area of effect weapon is effective on big groups of rats, but it seems to hit smaller groups that are spawning ahead of the group more often.
Pretty well balanced, but the lack of a controls tutorial makes this tricky to recommend.