Hey, another Minetest fan!

I like Minetest, Minecraft, and any other games where one can build in first person while using things they build. I have a fairly unique idea of making one with a very small, subdividable block grid, ray traced graphics, and very realistic mechanics. I wish there was a name for this genre though, regardless of if the game is made of blocks (one of my ideas for this game was to use voxels with volume rendering instead of blocks).

Edit: Perhaps something like "immersive constructor"? I often use these games kind of like a 3d modeller, and like them because I can make something and use my creations.

Edit 2: Perhaps "world simulator", because they simulate worlds one can do things in, without forcing one into any story or gamification.

Edit 3: I made a sub and subreddit.

Edit 4: Or are these just called sandbox games?