Games like Siege of Centauri

Defense Grid: The Awakening is a tower defense game where players protect their base by building fortification towers against incoming enemies. With 8 hours of main storyline and many more in challenge modes, each level is highly replayable and can be solved in various ways. The game features 15 different enemy types that increase in strength over time, providing a wide variety of challenges.

Defense Grid 2 is the sequel to the original tower defense game, Defense Grid: The Awakening. It features a new story campaign with 21 maps, dynamic level movement, and an expanded cast of characters. The game also includes challenge mode experiences, multiplayer modes, and a level creation tool set for players to create and share their own levels. The Steam Special Edition comes with additional content.

"Taur is a single-player action-strategy sci-fi game with wonderful mechanics and fabulous visuals. Command the Prime Cannon, unlock and upgrade weapons and abilities, and build defenses to withstand different types of attacks. Every object in the environment is destructible, providing a tactically engaging experience, but beware of the heavy grinding."

Warstone TD is a fantasy tower defense game where players strategically place towers and units to defend against hordes of enemies. With various game modes, heroes, and towers to choose from, each level presents a unique challenge. The game features a compelling story campaign, online PvP, and co-op gameplay, offering a rich and immersive tower defense experience.

"MarZ: Tactical Base Defense" is a strategy game that challenges you to build a defense base and fight off zombie hordes on Mars. The game features a 20-mission story campaign, skirmish mode with customizable waves of enemies, and an intense "Outbreak" mode. Utilize powerful terraforming tools to create custom maps and share them via Steam Workshop, and research new upgrades for your towers. Recently updated with increased technology options and reworked balancing.

Sanctum 2 is a Tower Defense/FPS hybrid game where you protect oxygen-producing Cores from hordes of aliens. Choose from four character classes, customize your loadouts, and utilize elements from multiple gameplay genres to succeed in this intense and strategic game. Build defenses and then jump into the action to take out enemies in the FPS mode.

"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.

"Element TD 2 is a standalone sequel to the popular mod, offering 6 elemental types and 59 unique towers. Cooperate with up to 8 players to create elemental synergies and strategically place towers against increasingly difficult waves, culminating in an endless boss fight."

"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.

"Last Hope - Tower Defense" is a zombie-themed tower defense game with over 140 levels and a variety of heroes and towers to choose from. Players must defend against zombies, raiders, and other threats in an open world. Each hero has unique epic gear and skills, and towers have their own research tree to enhance their power. The game features stunning 3D graphics and offers different game modes including a story mode, raiders mode, and arena mode.