Yes, but the main advantage is that you don't have to publish your changes under a similar license (so you can even port to consoles). GPL also allows you to sell a game without paying royalties, but it requires you to license your game under a compatible license what's not the case for MIT. Basically you can modify Atomic for your specific purpose and keep it fully yours. You can maintain a branch with your features and rebase to keep it updated. Contributing back is cool though, but if that's not an option you can always proudly display a splash or donate to show your appreciation .
Also, nice bash on Unity @JimMarlowe .