255 Tile Pixel Art Pack
Author: wareya
Public Domain
https://opengameart.org/content/versatile-255-tile-pixel-art-pack

Original: ufeff_tiles_v2.png
Upsampled to 64x64 tiles: ufeff_tiles_64x64.png
Upsmapled to 128x128 tiles: ufeff_tiles_128x128.png