If so, how exactly?
Honestly I think this site is a near perfect drawing exercice :
-The timer forces you to come up with quick sketches and concepts, without focussing too much on the details.
The limited color palette and general options forces you to forget about more advanced notions, and just draw. (For example, many beginners struggle with all the tools in Photoshop, using fancy brushes when it's not needed at all)
The game in general forces you to draw stuff 1- you suck at drawing 2- you wouldnt even think of in your wildest dreams, so it's a huge creativity boost.