Zombaaa is a roguelike game that combines building. Wave after wave you will have to survive to prove that you are the most adaptable to these conditions.
Hordes of various zombies will try to eat you every time, but you have a whole arsenal of weapons, abilities, mines and turrets!
Try to run and use automatic gunfire. Try to build a real killbox or some other tactics. Youre free to do whatever it takes to live as long as possible.
Try to go through a whole campaign of arenas taking the challenge.
All of this is seasoned with a recognizable and enjoyable leveling system and increasing difficulty.