Top similar games like Alien Defense Unit:

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!

Terrorformer TD is a tower defense roguelite with a procedurally generated map that YOU shape! Raise or lower tiles, divert enemy paths and funnel monsters into perfectly designed killzones. Randomly drawn cards result in plenty of run variety, as you seek to survive endless waves of enemies.

DPSWTF is a base defense game with roguelike elements, where instead of placing towers, you build the best tower of them all. Combine the best projectiles with effective modifiers and push back the incoming hordes. Research them all to conquer the secrets of the Great North!

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.

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.

17.waves is an online co-op tower defense game for two to four players. Strategize with your teammates to build, upgrade, and maintain your towers to defend your base from hordes of enemy monsters.

Defend the crystal from the relentless swarm of Bugs. Team up with your allies to repel the enemies and restore hope to a world on the brink of despair.

Defend against interdimensional (wow!) monsters in this open field (huh?) tower defense game.

Dive into Paradise Defense Force, a twin-stick tower defense game. Cast spells, upgrade your wizard and strategize as you repel waves of enemies in a fantasy world teetering on the brink

On Planet Rhapsody, every beat counts! Build and upgrade defensive towers that double as musical instruments, each adding layers to the dynamic soundtrack. Sync your defenses with the music to unleash powerful attacks and keep the rhythm-hating Creeps at bay.

Relive your childhood in Treefender, a VR-exclusive 4 player online co-op base-building game where you build your own treefort and defend it against a spacesquid invasion!

Farm, Build, Defend, in the Galaxy's only Arcade-Tower-Defense.

Universe Wars is a multiplayer game similar to Plants vs. Zombies. Plants become evil Earthlings, and zombies become cuddly three-eyed aliens. And on the basis of "Plants vs. Zombies" and increased the multiplayer online, fashion system, formation evolution, protagonist system.

Defend the Oval Office from an endless alien invasion by harnessing the abilities of your favorite (or least favorite) U.S. Presidents.

A solo development and the first game of Processor Game Studios presents "VOLCAN defend the Tower". A third person shooter on an open world sci-fi game, play as Sollum to defend your Volcan Towers against your enemies while exploring a planet earth with nature restored

The age of an active space conquest by Humanity. You are a simple scout who had been sent out to explore a new planet. You must collect information about it and transfer it to the Center. But is it all that simple or is there anything you still don’t know?

XenoFeud is an insane top-down twin-stick arcade alien shooter, where you must survive hordes of alien intruders while defending a mysterious object in space.

Beware Planet Earth! is a beguiling mix of classic tower defense and time management coming to PC via Steam for the first time. Save your cows from the Martian invasion by building an effective defense using towers, traps and objects, and also by firing your Zapper directly at the invading force of little green men!

Invader TD is a side scroller tower defense, where the player is in the role of an alien race with the purpose of infecting and dominating the earth, you must protect yourself from the attacks of the humans, who are trying to destroy you.

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.

Escape From The Red Planet simplifies resource management, tower defence, and first-person mechanics into a singular arcade experience. On the latest mission to Mars, the Orion III crash-landed. With Martian attacks looming, Houston most definitely has a problem!

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.

Project Astra Dominium is a Tower Defense game with Basebuilding and Automation elements. Build up your base to become a supply hub for Earth's desperately needed materials, gather resources while defending against an unknown alien threat and improve your tower's and AI capabilities.

TEP the destroyer is a single player tower defense game where you will face alien monsters and ships in ground and space battles! Your strategy will decide the fate of your people in a sci-fi environment of varying difficulties!

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!

Players measure stamina with a never-ending stream of green creatures within the borders of a special military mission.

Protolife is an unique tower-based strategy game which gives you a direct control over the builder robot in a struggle against the hungry proto-life organism.

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!

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!

AT THE LIMITS OF EARTH, AT THE EXTREMITY OF HEAVEN. A REAL-TIME STRATEGY NIGHTMARE.

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.