I am sorry, but what am I missing - where is the interaction? I can't interact with the art I create. What is the difference between this and Photoshop (or any

I am sorry, but what am I missing - where is the interaction? I can't interact with the art I create. What is the difference between this and Photoshop (or any other image editor for example) except for it being browser based and playing some sounds in the background? It is very well done, and what you can make with it is very impressive. Good work!