There is a chance I may use more of your pieces in the game:
In case you don't know, minetest is a free game engine and all of the games made with it are free too, so it is not a commercial use. You will be mentioned in the credits, because you're awesome.
The game has tons of biomes and you can visit most of the solar system as well as new alien worlds, and I will use some of your pieces as BGM for some of these locations.