TerraTech (Both 1st and 2nd game)- It's an open world game where you create your own vehicle by land, air, and sea. Just as
ohio920dagamer said, it's a fun game especially if you like to tinker with vehicles. There are variety of weapons and tools you can use for shooting down other tech or for gathering resources, and some of it cannot be access until you finished some of the mission (unless you got the DLC to test your tech in creative mode). Everyone can share their tech creations including stationaries/structures. I haven't played the 2nd game, but I heard some features from the 1st game haven't been added in it.
Links:
https://store.steampowered.com/app/285920/TerraTech/
https://store.steampowered.com/app/2313330/TerraTech_Worlds/ Spore (Very old game)
- A Sandbox game where you create your species and evolve it until it reaches certain stages (Cell, Creature, Tribal, Civilization, Space). For each stages, you can customize the appearance of your creature, their tribal outfit, the vehicle and structures of their civilization, and the spacecraft you're going to use to explore around the galaxy. There's also a DLC feature where you can explore planet and do mission. Everyone can customize their own mission for players to play too.
Link:
https://store.steampowered.com/app/17390/SPORE/
