Yet Another Zombie Defense

The Steam version of Yet Another Zombie Defense has a number of additional features, most importantly a new game mode (Endless Night which is just the zombie combat without the shop) and character development (the following statistics can be upgraded: speed, reloading speed, toughness, health regeneration, pickup range). Other than that, there are also additional weapons (e.g. mines, chainsaw or upgraded turret) and more power-ups left behind by killed enemies (invulnerability, fast reload, invisibility, speed boost and magnet). In contrast to the original Windows port, there is also co-op multiplayer.