Don't Starve Together

Don't Starve Together

What do you call this artstyle?
It's common in Unity games.

I'm guessing it's because of some way that the Unity Engine is able to manipulate images or something, IDK, I've never used the Unity Engine.

You see it a lot though from Unity games, especially mobile ones.

What is this artstyle called? It's fairly common for 2D Unity games and Mobile Games.