Games like Alien Defense

"Circle Empires is a fast-paced RTS where you expand your empire across interconnected circles, each with distinct enemies and resources. With each playthrough offering a unique world, test your skills in large-scale battles and grow various crops, including pumpkins. Originally a beloved demo, this full game now offers even more strategic depth."

Reignfall is a single-player Fantasy Hack and Slash game with real-time strategy and city-building elements. Oversee resource production, command armies, and control heroes in battle against procedurally generated maps. Master the unique playstyles of 7 characters, including your Lord, and test battles in the Battle Tester mode.

"Conan Unconquered" is a fantasy real-time strategy game where players can team up in multiplayer co-op mode or play solo, building a stronghold and assembling a massive army to fend off hordes of enemies. The game boasts good mechanics, pretty visuals, and a sensational soundtrack, but can be very grinding and buggy. Players must rouse the lazy and feeble people of Khoraja to defend their kingdom from the tyrannical wizard Thugra Khotan.

"Necrosmith" is a single-player fantasy hack and slash game with excellent mechanics, splendid visuals, and a fabulous soundtrack. As a Necromancer, you assemble and upgrade an army of undead creatures, combining body parts to optimize their combat abilities. Explore diverse biomes, build up your necro labs, and escape from this strange world. The game offers a good plot and humor, with some grinding required. Don't forget to check out Necrosmith 2 and Wall World.

In "Eador. Imperium," a turn-based strategy game with RPG elements, players must manage their empire, build armies, and engage in battles. The game features a new and handcrafted story campaign, introducing new heroes, units, and Shard worlds. With the inclusion of all original content from "Masters of the Broken World," players can expect a vast strategic experience.

Crush hundreds of minions as the powerful giant troll! Tiny Goblins call on you to protect their fort, in exchange for armor, money and new moves to smash and loot minions! Goblins build towers, barracks and catapults over each wave to help you fight back bigger minions and bosses!

"2112TD: Tower Defense Survival" is a futuristic tower defense game with strategic base building elements. Defend your refinery from alien invaders across procedurally generated levels with a variety of turrets and special abilities. Upgrade and customize your arsenal to survive increasingly challenging waves in this intense, sci-fi tower defense experience.

Robot Colony is a single-player strategy game where you build robots to defend your colony from invading bugs. It features excellent game mechanics that require careful planning and resource management, though progress involves a lot of grinding. While engaging, the experience is sometimes disrupted by frequent and annoying ads.

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.

Digfender: Tower Defense TD is an epic single-player mining strategy game and sequel to CastleMine. It features perfect gameplay and good graphics, combining tower defense mechanics with resource management. While engaging, the experience can be very grinding and is occasionally interrupted by annoying ads.