Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics

I'd like to use these in Unity but cannot find any tutorials for how to use tilesets in this format. Can anyone recommend any? 

For example: do I need to manually separate the tree from the foreground to use this tileset, or am I missing something? 

What are the black and white squares in the tileset png good for? 

(I've tried googling for answers to these but am a total noob in 2D gamedev and using tilemaps. Unity's standard tutorials for tilemaps seem to be not exactly what I need here)