Games like Cube Universe

StarMade is a free-to-play Sci-Fi Shooter game, currently in Alpha, that offers single-player, local multi-player, and online co-op/PvP gameplay. Players can support the developers by purchasing the game, which will grant access to future updates and exclusive features such as blueprint hosting and multiple skin uploads. Despite some optimization issues and bugs, the game offers plenty of humor and grinding for space exploration and battles.

"Solace Crafting" is a laid-back open-world RPG that allows infinite exploration in all directions, with increasing difficulty for monsters and resources the further you travel. Build your own base with crafting and refining facilities to create proper equipment and fast travel networks, while using resource scanners to locate rare materials. With no set classes, create your own unique character and set off on your adventure.

Planet Explorers is an open-world sandbox adventure game set on a distant planet. Players can build and customize their own tools, vehicles, and structures, while also gathering resources, completing missions, and fighting alien creatures. The game features a dynamic story generation system, allowing for a unique experience with each playthrough.

"Boundless" is a massively multiplayer role-playing game with fantastic mechanics and delightful visuals, allowing up to 2 players to cooperatively or competitively explore, build, hunt, trade, and craft across a variety of interconnected planets. The Harvest Era update brings even more features to this already immersive game. With the option of in-app purchases, players can impact the universe and forge their own path as they choose between various professions.

Interstellar Rift is a sandbox-style RPG set in the vastness of space. Players can explore, trade, and build their own spaceships as they navigate an open world filled with procedurally generated galaxies and alien races. Collaborative gameplay is encouraged, with the option for players to form factions, engage in piracy, or work together on massive capital ships. The ship-building aspect is highly detailed, allowing for customization of every aspect from engine to weaponry.

"Rising World is an open-world, voxel-based sandbox game with fully destructible environments. Gather resources, build and create your own structures or cities, and survive in the wilderness, alone or with friends. The game features a randomly generated world, drivable boats, and over 200 building materials." Note: The game is currently undergoing an engine migration and may differ from the store page description. A preview of the new version is available in a beta branch.

VoidExpanse is a science fiction action-RPG set in deep space, allowing players to explore procedurally-generated galaxies, engage in real-time combat, and interact with dynamic factions. The game features complex mechanics for mining, trading, and character customization, as well as a meaningful storyline and options for both single and multiplayer gameplay. Upgrade your ship, complete missions, and advance through diverse skill-trees in this open-world space adventure.

Pax Dei is an open-world multiplayer RPG where players craft tools, battle enemies, and explore to gather resources and gold. Accumulate Grace to perform powerful Miracles and claim personal plots of land to build and expand. Engage in trading or combat with others as you carve out your own path in a dynamic, player-driven world.

"Portal Knights" is a 3D sandbox action-RPG where players craft their own adventure, forge their hero, and become the ultimate Portal Knight. Explore randomly generated islands, combat enemies in real-time tactical combat, and restore peace to a world torn apart by The Fracture. Build and design your own island, mine resources, and complete quests in this cooperative, immersive game.

"Stellar Tactics" is a turn-based space combat and exploration game with classless character progression and customizable squads. The game features 160,000 Star Systems, 40 ships, and various equipment items that can be upgraded with Nano-Tech. Players can mine asteroids, trade commodities, capture ships, and engage in ground battles against hostile forces. The game also includes classless character progression with 240 perks for unrestricted customization.