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file: data/materials_gfx/test_vine.png 

Uses image: 
https://www.flickr.com/photos/martisimas/5454695132 by martisimas
under CC BY 2.0 - Attribution 2.0 Generic (CC BY 2.0)

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data/biome_impl/spliced/skull_in_desert

uses image:
https://www.flickr.com/photos/75398626@N08/6772632125
"Skull at Clearbury" by justfluff is licensed under (CC BY 2.0)

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data/biome_impl/spliced/tree_visual

uses: 
https://www.textures.com/download/barkpine0007/4894

Can be used in commercial products, doesn't need any credits

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data/biome_impl/dragoncave.png

uses:
https://commons.wikimedia.org/wiki/File:Eggs_of_British_Birds_Seebohm_1896_Plate21_The_Common_Loon.jpg

It is in public domain - no need for credits

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data/biome_impl/moon.png 

uses:
https://commons.wikimedia.org/wiki/File:FullMoonHauknes.jpg

Under CC Attribution 3.0 Unported
Frode Steen

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Freesound audio:

This video game uses these sounds from freesound:
Generator1.wav by HerbertBoland 
https://freesound.org/people/HerbertBoland/sounds/114594/
under the Creative Commons Attribution License 3.0

Distant explosion.wav by juskiddink
https://freesound.org/people/juskiddink/sounds/108640/
under the Creative Commons Attribution License 3.0

Explosion004.wav by klangfabrik
https://freesound.org/people/klangfabrik/sounds/220062/
under the Creative Commons 0 License 1.0

ELEMENTS_FIRE_01_Burning-Room.wav by suonho
https://freesound.org/people/suonho/sounds/17725/
under the Creative Commons 0 License 1.0

Shepard Tone by BrainClam
https://freesound.org/people/BrainClaim/sounds/274487/
under the Creative Commons 0 License 1.0


Please find the full Creative Commons licenses under the licenses folder in the game directory.

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Ocarina samples by Charly Fariseo
https://www.ableton.com/en/blog/instruments-from-pre-columbian-america/