This demo includes 6 pixel art sky backgrounds
It's a free demo of a background pack called 'Pixel Skies Background pack' which contains 50 pixel art sky background in similar style & sizes like this demo background pack does. You can find the asset pack here:
https://marketplace.yoyogames.com/assets/10998/pixel-skies-background-pack
tip! You can combine layers from different backgrounds to make completely new sky backgrounds
Details Resolution: 240x135px and 1920x1080px (Full HD) These DEMO backgrounds are free to use in both personal and commercial projects
End User Licence Agreement (EULA).