https://opengameart.org/content/plain-fieldsJohan - Brodd
https://opengameart.org/content/undergroundIvy Fae - ivyfae.com - @lalan
https://opengameart.org/content/snowy-winters-night - Ted Kerr
https://opengameart.org/content/simple-desert
https://opengameart.org/content/dungeon-02 - www.fantasymusica.org 

Coin : https://opengameart.org/content/10-8bit-coin-sounds - www.rustltd.com
Jump : https://opengameart.org/content/8-bit-platformer-sfx - 8-bit Platformer SFX commissioned by Mark McCorkle for OpenGameArt.org ( http://opengameart.org )