Top similar games like Aliens falling from the Sky?:

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!

The first ever auto-battler game, from way back in 2009Who needs backstory? Who needs resource-gathering? Diplomacy is so last year. Gratuitous Space Battles cuts right to the chase of sci-fi strategy games, and deals with large, completely unjustified space battles between huge opposing space fleets.

Space Nature Attack TD is a tower defense where you can level up and customize tower stats and elements to your liking! Fend off various types of alien creatures across many different sci-fi planet themed maps, biomes, and difficulties!

Armoured Onslaught is a fast paced Top-Down Shooter and Tower Defence hybrid. You will need to make use of both strategy and skill as you fight your way through near endless hordes of deadly foes.

Lead an armored squad through the perils of this reversed tower defense action-strategy game!

An epic, challenging tower defense game with an emphasis on strategy and replayability. Summon gems of immense magical potency and harness their unique abilities against a seemingly endless horde of monsters. The archdemon seeks to swallow the world, and you must journey to stand against her.

Taur is an action-strategy sci-fi game. Control the Prime Cannon and unlock all of its powerful weapons and abilities. Build turrets, droids, aircraft and more as you fight to protect the homeworld of the Tauron droids against a relentless invasion. Will your Taur stand against the Imperion warmachine?

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.

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!

2D space shooter and turret defense come together to create the Planetary Defense System this world needs! Shoot down asteroids and aliens and survive the bosses in this arcade like game featuring customizable satellites, projectiles, and upgradable Cannon and Planet Shield systems.

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.

Command a team of 5 elite soldiers against an alien horde of 100,000. Surrounded on all sides, you must outmaneuver and outsmart the enemy.

Top-down action and space exploration meet asteroid mining automation! Navigate to randomly generated asteroids passing by and start mining. Impress your employer, upgrade your equipment, fight off pirates and save up for that ticket to Earth so you can finally come home... for the very first time.

A spaceship building and universe-exploration game. Collect resources, expand and grow your fleet, and conquer your personal galaxy. Stellar ambience by Peaks.

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!

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

Scrap Bastion is a strategy tower defense game where you manage your city, equipping it to survive the waves of mutant creatures, testing your planning and decision making capacities at every turn. Watch out, as time is crucial to win!

A strategic and action-packed base survival game where you mine crystals, build units, and defend your base against waves of UFOs. Defeat enemies, gather resources, and unlock new planets to expand your defenses. Are you ready to conquer the galaxy?

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!

A fun physics-based tower defense game where you build your own base and maze. Featuring a very cute dog named Buster and his evil twin named busteR.

Forge invincible defenses with lethal traps and devious machines, and crush relentless waves of adventurers in the ultimate tower defense showdown!

Fury of West - Top Down Shooter, a top down shooter game, where your mission is to control a cowboy with an unusual revolver, your task is to look for ways out of the intricate labyrinths of the Wild West, simultaneously shooting back from thugs, avoiding the spikes and arrows

Enjoy this full strategic Tower Defence with something more. To complete each level you must defend from hordes of aliens and then attack their Teleports to stop them from coming. And, in the end, defeat the Bosses!

Pilot a stolen alien ship in a rebellion against the Archronite invasion. Fly across the archipelagos of your home world and capture enemy bases with the help of your navigation droid co-pilot, DFX-9T. Battle against enemy Arc Vectors, Fighters, Drones and Laser Tanks, liberate your planet, Melos.

Starfall Defenders is a classic tower defense game that features unique towers and enemies. It also has an in-game shop system that allows players to purchase better towers, upgrade existing ones, and buy special items like the Atom Bomb, Splash Bomb, and Air Supply.

Drone Swarm is a very unique take on tactical games. Control 32,000 drones in quick, fast-paced fights. Combine your swarm abilities and counter constantly evolving attacks of your opponents. Survive varying enemy waves, get upgrades to your swarm, and make it to the next system alive!

Spectral Realm is a top-down tower defense Rogue game, where players need to play the role of an astronaut who has just landed on a different planet to block a constant stream of attacking native creatures and continuously strengthen themselves with the gems contained within their bodies.

Creeper World 3 is what happens when cellular automata takes over a strategy simulation. Instead of discrete units that attack your base, a fluid-like substance spreads over the terraformable terrain. Your base, your weapons, your strategy... you must adapt them all.

A light tower defense game with unique planet exploration. Defend against aliens, collect resources, and build a new home. Exquisite graphics and challenges await!

A classic tower defense game set in space! Build and upgrade towers, defend your portal from waves of alien invaders, and outsmart evolving threats across handcrafted and procedural maps.

A Roguelike Tower Defense in space with missions to conquer. Can you hold against the spreading alien bosses? Build and upgrade towers against the corruption. Choose your technologies and warpspeed your way to victory.

Stealth and tactic game that give you the control of an alien that evolves, adquire new abilities and face levels in various ways.

Halo: Spartan Assault brings the excitement of Halo combat to Steam for the very first time. Battle your way through 30 action-packed missions against the Covenant as you explore the origin of the Spartan Ops program featured in Halo 4. *DirectX feature level 10 required. *

Solar Defense is a Military Sci-Fi inspired Tower Defense game focused heavily on strategy and decision making. Defend key locations and repel the Pilakarr forces back to their home world to end their attack and bring an end to this war.

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.