Grass Tileset:
CC-BY-SA 3.0
Bonsaiheldin
https://opengameart.org/content/grass-tileset-16x16

Clint Bellanger for Liberated Pixel Art
https://opengameart.org/content/animated-coins


Public domain:
Universe big takedown by Komiku
https://www.chosic.com/download-audio/25142/