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.

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.

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.

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!

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.

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.

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.

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.

Great strategy is timeless. Build, adapt, and defend across dynamic maps, solo or online - every session brings new strategies, new solutions, and new surprises. Now is the perfect time to enter the grid.

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.

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!

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

A hybrid card game and tower defence where the hands you play become the towers you build. Defeat the enemies approaching the bear's den and find modifiers that support the elements of your defensive strategy.

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!

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!

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

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.

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).

A single-player VR tower defense shooter. Warp between two lanes, shoot down incoming enemies, and defend the gate. Choose upgrade cards between waves to boost your firepower, projectile speed, and more. Designed for seated play and comfort, while keeping the defense fast-paced and intense.

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!

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!

Titan Isles is a high-mobility action-adventure shooter where you pilot four unique Exo Suits, each with its own combat style and movement mastery. Upgrade your abilities, battle colossal Titans across the Isles, and play solo or with up to three friends in seamless 4-player co-op.

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.

A tower defense roguelike about robots and ooze. Play solo or local multiplayer, protect the Glorp, and defeat the creeps. 

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.

Build towers, defend two sectors and your shared reactor against endless machine waves—alone or in online co-op. Every battle matters: In THE GREAT WAR, the global frontline shaped by all players grants unique bonuses and penalties in every match.

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.

Grow. Defend. Survive, land on deadly alien worlds where every day is a race to gather resources, and every night becomes a desperate fight for survival in this action-packed tower defense roguelike.