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i dont know the website says ""Voxel Revolution" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
http://creativecommons.org/licenses/by/4.0/"

Then it's okay to use it in your game, as long as you credit the artist, and you can put your game's assets as a whole under any license you want. But I'm not a lawyer, and you should ask one if in doubt.