Games like Portalethium

"Colony Siege is a blend of RTS and tower defense gameplay, allowing you to defend your colony through base building, unit physics, and various weapons like towers, traps, and mobile units. Two enemy factions, the biomechanical xeno swarm and the corrupted Riven, require different strategies. The campaign offers single player and 2-player online co-op in a non-linear setting."

Drill Core puts you in charge of an elite team managing a high-stakes drilling platform, where strategic leadership and resource management are crucial. Navigate dangerous missions, coordinate miners and guards, and make critical decisions to extract vital minerals while combating climate collapse. Every choice impacts the success and safety of your operation.

"Alien Hallway" is a real-time strategy game that puts you in command of a military team fighting against an alien invasion. Equip your squad with a variety of weapons and abilities to strategically eliminate the extraterrestrial threat. Navigate through levels filled with traps, unlockables, and dynamic environments to save humanity from total annihilation.

"Run Build Pew!" is a voxel-based game where you play as a knight battling enemies while building your own fortress. Collect resources, craft items, and strategically place defenses to protect your base in this unique blend of action and strategy gameplay. With procedurally generated levels, the challenge is different every time.

In "Infinium Strike," players defend their space carrier from endless waves of enemy ships in a real-time strategy setting. Utilize a variety of customizable turrets, defensive maneuvers, and upgrades to repel the alien threat. Experience a thrilling campaign spanning 14 missions and take on additional challenges in Endless Mode, testing your strategic prowess.

"Deadstone is a Sci-Fi Role Playing game where players assume the role of a private security operative, Blake, stranded near the Mars colony of Deadstone during an outbreak. The game features both single-player and local multi-player modes for up to 2 players in co-op, with a split screen option. In the story-driven Campaign, players must defend against an unrelenting enemy and save the colonists, or test their survival skills in the Survival Mode."

"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."

The battle against Zotrix aliens is getting closer to your door step. Every space station in the network is in danger and Solar Division command needs your help to setup proper strategy for the defense. This, primarily strategy game, blends game mechanics between tower defense and real time strategy with hybrid elements such as patrolling ships, navigation towers. You are trusted this important t…

"Artificial Extinction" is a Sentry Defense game with Real Time Strategy elements, played from a First Person perspective. In the future, you play a colonist searching for a peaceful planet, only to find that the AI-driven terra-forming robots have turned hostile. With just 9 days to find a safe location, can you protect yourself and prepare for your family's arrival? The game tackles relevant topics such as AI development, LAWS, and military robotics.

"Earth Defense Force 2025" is a Science Fiction Shooter game that offers both single-player and multiplayer/co-op modes for up to 2 players. Eight years after the first alien invasion, the Ravagers have returned, stronger than ever, forcing the EDF to once again save humanity. The game offers a wide range of weapons and character classes, providing an action-packed shooting experience against menacing giant aliens and insects.