From one lover of Satisfactory to another
Here's a preliminary list for you. The first game is the most like Satisfactory, but the rest might be of interest to someone who enjoys the sorts of things you do in Satisfactory.
Astro Colony is sort of Satisfactory in space. It's not quite as complex, but I found it quite fun and easy to learn. Travel on your station to planetoids. Even hook the best ones up to your station and take them with you. Gather resources and have your researcher unlock new tech. Build complex factories and eventually travel through black holes to new universes.
Explore endless Universe and create the most efficient constellation of colonies. Build conveyor systems to automate production. Take care of Astronauts and their needs! Establish new colonies as part of intergalactic simulation.
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Build a factory without conveyor belts while managing your people and building up your community in a voxel world similar to Minecraft in Colony Survival. If you want to, defend against nightly monster attacks by setting up your archers, building walls, etc.
Colony Survival is a unique first-person strategy game developed by a two-man team. Build your own colony in a voxel world. Command guards, farmers, miners and other colonists. Defend your colony against the horde of monsters that attacks every night!
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Planet Crafter is a first person survival/crafting/building game where you terraform a planet similar to Mars. Fun and relaxing with no combat. You can turn off losing items when you die (usually from running out of oxygen), which makes it even more relaxing. Dying just becomes a quick trip home. Great exploration and advancement. Lots of systems but not hard to learn at all. Some good mods available.
A space survival open world terraforming crafting game, designed for 1 to 10 players. Alter the ecosystem of an inhospitable planet to render it habitable for humanity. Survive, gather resources, and build your base. Then, generate oxygen, warmth, and pressure to create a brand new biosphere.
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Design and build the perfect space ships in Cosmoteer. Travel around the galaxy in your ships gathering resources, fighting pirates, doing missions, etc. Very challenging to make the best ships. Game is easy to learn, hard to master.
Design and simulate the starships of your dreams! Command your ship or fleet in epic battles and manage your crew while exploring a dangerous galaxy. Play alone or with friends, test your ships in online PvP, and let your imagination reach for the stars!
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Avorion is sort of a 3D version of Cosmoteer with great ship building and exploration.
A procedural co-op space sandbox where players can build their own space ships out of dynamically scalable blocks. Fight epic space battles, explore, mine, trade, wage wars and build your own empire to save your galaxy from being torn apart by an unknown enemy.
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I really like Big Ambitions. It's an isometric business game set in New York. You pick your locations and set up anything from gift shops to hair salons to law firms. You buy and place the fixtures, hire and train the employees. You'll also set up a home office with personnel managers, etc. and have warehousing and deliveries to deliver to all your businesses each day with stock that you get from importers or wholesalers.
Big Ambitions is a revolutionary role-playing business sim. Go from nothing to the biggest entrepreneur in New York by opening small businesses or slowly building huge corporations any way you like.
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Two colony sims I have sunk some hours into are Kingdoms Reborn and Timberborn. What sets KR apart from other colony sims is that you lead your community from the middle ages all the way to modern times. In Timberborn you lead a post apocalypse community of beavers. Both can be as relaxing or stressful as you want to make them. Both are easy to learn. Timberborn doesn't take a ton of time to play and there are two factions and multiple maps. KR has 4 factions and maps can be randomly generated.
A city builder with simulated citizens, set in a procedurally-generated world map. Grow your kingdom through the eras from a tiny medieval hamlet into a prosperous global empire! Cooperate or compete in real-time with your friends in multiplayer mode.
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Humans are long gone. In a world struck by droughts and toxic waste, will your lumberpunk beavers do any better? A city-building game featuring ingenious animals, vertical architecture, water physics, and terraforming. Contains high amounts of wood.
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If running a farming business sounds fun, there's always Farming Simulator 22. Buy a farm and equipment. Work the fields or hire farmhands or both. Decide what and when to plant. Build factories (not the same way as in Satisfactory) to process your crops further to bring a better price. Deliver the crops to the right seller for the highest price. Etc.
Create your farm and let the good times grow! Harvest crops, tend to animals, manage productions, and take on seasonal challenges.
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Want to try your hand at running an auto repair and customization shop? Car Mechanic Simulator 21 is very highly rated (all these games are) and you can do everything from taking jobs from customers with car problems to wandering through barns and junkyards looking for cars to restore. Jack those cars up with custom parts and take them to the track for a timed test drive. Very in depth systems that are somehow extremely easy to use.
Work your way to a service empire. Get your hands dirty in a highly realistic simulation game that pays major attention to details. Pay a visit to a new Auction house and buy cars in various conditions. Expand your range of services by investing in a new work space and equipment.
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Like doing handyman work and decorating houses? You might like House Flipper
House Flipper is a unique chance to become a one-man renovation crew. Buy, repair and remodel devastated houses. Give them a second life and sell them at a profit!
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Like commercial aquariums? Design, stock and manage one in Megaquarium. Fantastic game with massive amounts of content and Steam workshop support that adds even more.
The public aquarium simulator. Design your displays, look after your fish, manage your staff and keep your guests happy! It's all in a day's work as the curator of your very own Megaquarium.
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Those are what I have for now. I'll look through my library later and see if I can come up with more suggestions. These are definitely some of my favorites, though.