Unity is pretty much the king of 2D games, but I like Godot 
I agree that now at times of Epic giving everything for free It would be great to see them hire atleast one developer which will work solely on Paper2D plugin.
You all might want to take a look at:
https://forums.unrealengine.com/unreal-engine/marketplace/1643429-pixel2d-the-sequel-to-paper2d-complete-2d-platformer-solution
and vouch for it.