A large library of pre-made blocks, each grouped in different categories.
What you gain is an access to a large library of pre-made blocks, they’re each grouped in different categories. You can place an unlimited number of blocks in your creation after which it’s possible to export and use in the game engine for your choice.
The exported models are compatible with most game engines including Unity, Unreal, CryEngine, Blender and ThreeJS. The 2D sprites (PNG) are compatible with all game engines.
You can find more detail on the tool and FAQ here.