Crey is described as 'CREY is a free, fast and playful way of making games and experiences. A creative platform'. There are more than 10 games similar to Crey for a variety of platforms, including Windows, Mac, Android, Online / Web-based and Steam. The best alternative is Minecraft. It's not free, so if you're looking for a free alternative, you could try Roblox or Buildbox. Other Crey like games are LEGO Worlds (Paid), Besiege (Paid), Core Games (Free) and Scrap Mechanic (Paid).
Minecraft is a sandbox game that revolves around using building blocks to create anything you want. At night, monsters come out; make sure to build a shelter before that happens. The game also has multiplayer capabilities.
Roblox allows you to create games, build whatever you want with lego-like bricks, play other games made by users of the community, and even participate in the economy by trading, selling, buying, and collecting items.
Mini World is a 3D free-to-play sandbox game about adventure, exploration, and creating your dream worlds. There is no grinding or leveling up. No IAP gate that locks features from free to play players.