Games like Portarius

Heat Signature is a spaceship-breaking game that lets you dock with any spaceship, sneak inside, and complete missions such as stealing loot or assassinating VIPs. You can take your time to formulate a plan, using gadgets and slowmo gunfights to outsmart the crew. The Supporter's Edition includes early prototypes, developer commentary videos, and the full soundtrack.

In "Nimbatus: The Space Drone Constructor," you are the captain of a mobile drone factory, where you can design and build your own custom drones using over 75 physically simulated parts. Explore a physics-based universe in three different game modes: a survival campaign, sandbox mode with adjustable parameters, and competitive arenas to show off your engineering skills. Confront challenging enemies and obstacles or focus on creative freedom.

"Weird Worlds: Return to Infinite Space" is a sci-fi, roguelike strategy game that takes you on randomly generated space adventures. Explore, battle, and survive in a procedurally generated galaxy filled with strange planets, alien species, and dangerous space creatures. Every playthrough is unique, offering a fresh and unpredictable experience with each journey. Make quick decisions as you manage your resources and navigate the unknown depths of outer space.

In "Spirits of Xanadu," explore a derelict starship and uncover its mysterious past through environmental storytelling and puzzles. As a space explorer, discover hidden secrets and use your ship's equipment to delve deeper into the abandoned vessel's history. Experience a hauntingly beautiful atmosphere and a unique blend of science fiction and Lovecraftian horror in this indie adventure game.

Far Horizon is an action-adventure RPG set in the far reaches of space where floating islands, beautiful vistas, and alien creatures await. Embark on an epic adventure of exploration, ingenuity, and survival as you loot, shoot, and craft to forge your destiny among the stars.

"BEEP" is a comedic single-player platformer game with perfect mechanics, splendid visuals, and compelling music. Players explore a hazardous galaxy using a gravity gun to solve puzzles and defeat enemies, making it a must-buy for platformer fans, despite some bugs. As Digital Entanglement notes, the anti-gravity gun makes for an authentic and unique gameplay experience.

Outer Wilds is an open-world mystery about a looping timeloop in a strange, ancient solar system. Explore ruins of alien civilizations, discover their secrets, and survive long enough to break the cycle in this immersive and engaging space adventure. With its unique narrative and intriguing gameplay mechanics, Outer Wilds offers a one-of-a-kind experience for fans of sci-fi and exploration.

In Phoning Home, players control ION, a crashed exploration unit on an alien planet, tasked with finding a way to contact their home planet for rescue while navigating the planet's dangers and forming a bond with a stranded service unit named ANI. Together, they embark on a challenging journey of survival and exploration in this third-person open world adventure game.

Shattered Planet is a roguelike game with procedurally generated levels, where you explore a dangerous alien planet for scientific research. The game features over 200 items, alien monsters, and class systems. Compete in the Daily Challenge, and clone your pets to maintain their DNA in their own clone vat. It's a challenging and fun game that brings new life to the roguelike genre.

"Ether One" is a first-person adventure game that explores the human mind's fragility through two paths. One path is a story exploration without puzzles, while the other involves solving complex puzzles to restore patients' life-changing events. The game offers accessible and optional challenging environmental puzzles, encouraging players to solve them with friends and family. It brings back pen and paper puzzle-solving for a nostalgic experience.