Games like Fortitude invasion

Spacejacked is a fast-paced arcade tower-defense game where you play as a spaceship technician named Dave, fighting off relentless alien invasions. Defend both the ground and ceiling by shooting up hordes of aliens and building turrets, while navigating between arenas via gravity flipping and teleporters. Experience the Story Mode with quirky characters and two major story arcs, or test your skills in the even faster-paced Endless Mode.

TurretGirls is a single-player warfare shooter where you defend Earth from mysterious alien invaders as Girl, a member of P.A.N.T.S.U. Upgrade your turret, build generators, and charge the superweapon to blast relentless waves of enemies. With fabulous mechanics, perfect visuals, plenty of grinding, and humor, it’s a thrilling and fun experience.

"Marfusha" is a single-player warfare shooter game with an intriguing story and delightful mechanics. As a border guard in a dystopian world, upgrades are crucial to facing increasingly powerful enemies, through cards purchased with heavily-taxed salary. With exceptional graphics, a good soundtrack, and a score attack ranking, Marfusha offers high-tempo action and is highly replayable, including 8 unique characters and various cards for weapons, power-ups, and chance events.

In "Pixel Gladiator," you are a contestant in a popular intergalactic gladiatorial show, set on an abandoned planet. Fight off deadly creatures to survive and earn money for weapons and upgrades, all while keeping your audience entertained with brutal battles. Use turrets, traps, and strategic camera work to your advantage, and be prepared to face treacherous bosses. The goal: become the champion of this cruel and bloody spectacle.

"Let Them Come" is a pixel-style survival shooter where you play as mercenary Rock Guner, tasked with eliminating alien hordes on a spaceship. Upgrade and customize your arsenal, utilizing FRENZY mode for maximum damage, as you face an onslaught of diverse enemies and boss creatures. Competitive players can climb online leaderboards and unlock new mixtapes as rewards for their shooter prowess.

RedEx is a single-player platformer game with great mechanics and amazing visuals and music. As a saboteur, fight against the mercenaries of the RedExpress logistics corporation using Tower Defense mechanics, a varied arsenal, and unique characters. Upgrade your character, defeat location bosses, and enjoy the nice visual component and style in this action-packed adventure.

"Space Gray X" is a challenging side-scrolling bullet-hell action game where you fight alien invaders across the Solar System. Unlock advanced aircraft and weapons to stand a chance against formidable enemies in this intense, adrenaline-fueled experience. Your mission: protect humanity from annihilation.

"Fortified is a thrilling strategy shooter set in a 1950s retro sci-fi world, where players defend Earth from a Martian invasion. Combining third-person shooter, real-time strategy, and tower defense mechanics, players can enjoy single-player, co-op, or multiplayer modes, building defenses and wielding an arsenal of Cold War-era weapons. Protect the city against towering attackers and experience an exciting blend of gameplay styles for a unique and immersive adventure."

"GIBZ is a shooting game with good graphics and masterful gameplay, offering both single-player and local/online co-op options for up to 2 players. The game features a base defense activity, where players build and defend their base against waves of enemies and bosses, earning coins to unlock and upgrade various items. With the ability to unlock new weapons, hats, and achievements, GIBZ provides a challenging and engaging experience."

"Alien Marauder" is a sci-fi survival RTS game set in 2672 where Earth's resources have been depleted. Players must build and defend their base against Vexan attacks, managing technology and population growth while engaging in large-scale battles and hero development with roguelike elements. The game combines classic RTS gameplay with survival simulation for a challenging and immersive experience.