SAS: Zombie Assault 4 Alternatives

Alien Swarm is a F2P, Co-op, Alien, Top-down Shooter, Single and Multiplayer video game developed and published by Valve Corporation.

Alien Shooter 2: Reloaded combines the elements of Role-playing, Top-down, Action, and Shooter.

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Crimsonland.com - a top-down shooter with a touch of RPG: gain XP, choose perks, unlock weapons, and blast your way through aliens, zombies, and lizard men. Coming soon to Steam and PS4!

Helldivers is an Adventure-based, Shoot em’up, Co-op, Single and Multiplayer video game developed by Arroshead Games Studios and published by Sony Computer Entertainment.

Feature-packed 2D and 3D open source game engine.

Open Source

Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.

Alien Shooter is an Engaging, Action, Isometric, Role-playing, Top-down, and Single-player Shooter video game created and published by Sigma Team Inc.

Grand Theft Auto 2 is an Action-Adventure, Top-Down, Open-World, Single and Multiplayer video game developed by DMA Design and published by Rockstar Games.

Postal Redux is a Top-down Shooter, Action, Single and Multiplayer video game developed and published by Running with Scissors.

Neon Chrome is an Action-Adventure, Top-down Perspective, Rogue-Like, Cyberpunk, Role-playing and Single-player Shooter video game developed and published by 10tons Ltd.

Shadowgrounds is a 2005 Action, Top-down Shooter, Co-op, Isometric, Horror, Single and Multiplayer video game created and published by Frozenbyte.

Assault Android Cactus is an Action, Arcade, Top-down Twin Stick Shooter, Co-op, Single and Multiplayer video game developed and published by Witch Beam.

Biodrone Battle mixes the elements of Action, Strategy, Top-down, Role-playing, and Single-player video game by Voodoosoft.