Top similar games like Alien Defense Unit:

Sanctum 2 is the sequel to the world’s first Tower Defense/FPS hybrid game. Pick from four unique character classes and embark on a mission to protect the oxygen-producing Cores from hordes of deadly aliens who are threatened by their existence.

You think Tower Defense games are all about building? You thought wrong. Sanctum is not your average Tower Defense title. When the havoc starts, you get to join the fray! As one of the world’s first First Person Shooter - Tower Defense games, Sanctum has taken the best of both worlds to deliver an epic, one-of-a-kind experience.

Defense Grid: The Awakening is a unique spin on tower defense gameplay that will appeal to players of all skill levels. A horde of enemies is invading, and it's up to the player to stop them by strategically building fortification towers around their base.

Unique fusion of a top-down shooter and tower defense strategy. You are the invader! Use destructive weapons or lead your enemies into a maze of towers. Strategize in the build mode by carefully selecting various types of alien towers or throw yourself right into the heat of the battle.

Fortified is an explosive strategy shooter where players will defend the Earth against a menacing Martian invasion in the 1950s. Play as one-of-four pulp inspired heroes as they fight swarms of terrifying robots with an arsenal of Cold War era weapons and experimental technology.

A fast-paced VR arcade shooter, where you fire guns, shoot energy bows, and toss explosive spears to defend your base from an alien infestation. The bugs shoot back, so don't forget to duck!

Throbax TD is the "Tower Defense" game you are looking for: Help Ughlar fight his way through 50 levels, buy over 100 upgrades and get all of the 50+ achievements.

The humanity succumbed against the power of a aliens intergalactic empire, but managed to organize and establish a resistance army. Join the rebellious seekers of peace and help them defeat the evil that haunts the Earth.

OUTLIER is an adventure roguelite VR game featuring FPS and RPG elements. Control and mix various abilities, utilise an array of weapons, and explore breathtaking worlds, making for a diverse and progressive gameplay experience.

Brace yourself for a brand new action-packed Open World. Explore a huge world to gather materials for gear and defenses. Use everything at your disposal to defend your bases and defeat hordes of hostile monsters. Play solo or up to 8-player online!

Defend your tower for as long as you can from the aliens invading your space! Level up, earn money and new units, and strategically place them in the grid!

Be the ultimate CEO and military strategist in this genre fusion of strategy and business management. Create your own company, hire employees, research weapon technology, and take control of units on the battlefield to defend the moon against an alien invasion. Aliens down, profits up!

Build towers and learn abilities to defend against swarms of hundreds of on-screen hostile alien creatures. Choose between sets of randomized upgrades that both upgrade you and the alien swarm. From enormous explosions to far-reaching flamethrowers, no two games are the same.

The ultimate mash-up of Real-time Strategy and Tower Defense!

Super Sanctum TD is a retro-styled Tower Defense game that focuses on strategy, customization and replayability. Build advanced mazes and construct powerful towers to prevent alien hordes from reaching the Core!

Galactic Rangers VR is a first-person space action VR game, deeply immersive, just as arcade shooter should be. Grab your pair of blasters and fight through endless waves of enemies for as long as you can!

Synthetic Paradox is a sci-fi action rogue-lite mixed with tower defense elements. Fight never-ending waves of enemies and bosses, collect items and build up your defenses alone or in co-op for up to 4 players! Discover unique combinations of towers and items to help you protect your Core!

ZAMB! Endless Extermination is a mash-up of a twin stick shooter and a tower defence game. Play in local co-op or online with a friend, sibling or partner as two space agents, Cye (the brawler) and Chrome (the tactician).

Faith & Shield: 4044 Tower Defense game, where you protect the human settlement from the incoming invaders, robots and other creatures, never seen before on our planet.

This is a sci-fi VR action shooting game. Mechanical frenzy is coming! Players have to teleport to survive from thousands of bullets.

A fast paced garden defense game. Collect what you can before the pests take over!

Dungeon Defenders Eternity is the definitive version of the original tower defense action-RPG! Now featuring a rebalanced endgame, all new missions, secure online play, links to Dungeon Defenders II and more!

The replicator robots are back! It's 2528. The machines are increasingly infecting the planets with genetically modified monsters. Challenge them and try to stop the onslaught. Upgrade buildings and heroes, mine resources, discover technology and fight to save humanity!

Five-star tower defense with unrivaled depth and replayability. The Bloons are back in full HD glory and this time they mean business! Build awesome towers, choose your favorite upgrades, hire new Special Agents, and pop every last invading Bloon in the most popular tower defense series in history.

With a style inspired by the RTS games from early 2000's, a new tower defense combines in a unique way action, tactics, replay value and fun. They are here! Choose your targets, upgrade, replay, discover your enemies and your tactical skills.

You believed tower defense is only about building towers? That's not quite right – because AIRA VR is not like other tower defense games in virtual reality. Once the battle starts you find yourself in the midst of the fight!

Design your own Superbot and fight alongside or against others in this VR battle arena! Make your own motion gestures to activate a variety of abilities and effects to aid you in destroying your opponents. Includes AI bots and different game modes like "smash off" and endless play.

Defend the solar system from fearsome aliens by sending satellites into orbit in revolutionary tower defense action!

Setting the bar as the definitive tower defense game, Defense Grid 2 introduces new worlds and threats to test your tower placement strategies. With a bold new look and the addition of new game modes, player-versus-player and multiplayer co-op, every play brings fun new opportunities and challenges.

Build your defense base to repel alien invaders. Atahion is a strategy and tactical defense game in which you have to extract resources, build defense towers and use bonuses to complete the mission.

Build your world and defenses in this unique and dynamic VR action-survival building game. Players can choose to casually build and save their own worlds or fight waves of robots in their world or in one of the unique environments. Players can utilize blocks and weapons to fight off waves of robots.

In the game you play the Pandean hero, Tin, which has a mission to save his planet from alien threat. You will be facing many obstacles thru different environments, where you will meet angry robots and funny looking animals.

A sci-fi roomscale VR Tower Defense game. Strategize to destroy waves of rogue robots and assist the powerful turrets with a handheld drone. Build and collect resources and help evacuate your crew from the alien planet.