Games like Alien Hallway 2

"Alien Shooter TD" is a tower defense game where players defend against waves of alien enemies. Players can build and upgrade towers, use special weapons, and complete missions to progress through the game. The game features various environments, multiple difficulty levels, and a campaign mode with continuing storyline.

Sanctum 2 is a Tower Defense/FPS hybrid game where you protect oxygen-producing Cores from hordes of aliens. Choose from four character classes, customize your loadouts, and utilize elements from multiple gameplay genres to succeed in this intense and strategic game. Build defenses and then jump into the action to take out enemies in the FPS mode.

"Zombie Defense" is a real-time strategy game where players must defend their base from hordes of zombies. Use a variety of weapons, special upgrades, and strategic planning to survive each wave. With endless levels, multiple difficulty options, and online cooperative play, the challenge to stay alive is always present.

Deadly Days is a strategic rogue-lite set in a zombie apocalypse, where you manage and protect a group of survivors to halt the catastrophe. With over 60 unique objects, 30 powerful abilities, and 25 weapon types, each playthrough offers a different experience. Your specialties can unlock new survivors, abilities, objects, and weapons, ensuring diverse gameplay.

Last Hope TD - Tower Defense is a single-player strategy game blending tower defense and RPG elements with customizable heroes wielding powerful skills and gear. It features an interesting plot, stellar graphics, and an outstanding soundtrack, offering highly replayable gameplay despite being very grinding and somewhat buggy. The game’s unique mechanics provide engaging tactical challenges.

"Ancient Planet" is a Tower Defense game where you defend an ancient civilization's stronghold from invasive alien hordes using upgradable towers and diverse strategies. The game features 40 unique levels, a variety of enemy types, and improvements that can be reset and redistributed at will. The game's storyline and setting are based on the memories of intergalactic war veterans and were created with input from the High Council of Intelligent Civilizations of the Galaxy.

"Taur is a single-player action-strategy sci-fi game with wonderful mechanics and fabulous visuals. Command the Prime Cannon, unlock and upgrade weapons and abilities, and build defenses to withstand different types of attacks. Every object in the environment is destructible, providing a tactically engaging experience, but beware of the heavy grinding."

Iron Marines is a real-time strategy game that puts you in command of a powerful army of space-age soldiers. Battle against alien threats and challenge challenging missions using cutting-edge technology and cunning strategies. With a variety of units, upgrades, and heroes to choose from, every playthrough offers a unique and engaging experience.

Anomaly 2 is a real-time strategy game where players lead a military convoy through a post-apocalyptic world overrun by alien machines. The game features tower offense mechanics, allowing players to tactically plan their path and manage their units to complete objectives. A multiplayer mode is also included, where players can take control of the alien faction for strategic battles against human forces.

"Guns n Zombies" is a thrilling post-apocalyptic game where you fight against hordes of robotized zombies infected by a nano-virus. With a variety of weapons, special abilities, and turrets, you'll embark on a dangerous journey through a randomly generated gameplay. The survival mode allows you to challenge yourself and compete with other Steam players, all while experiencing a true post-apocalyptic atmosphere.