Newgrounds is a very critical place that has had hundreds of thousands of submissions over the passage of time since it's "awakening" i like to say. Suffice it to say, people tend to hand out average scores more critically unless something reaaaalllyyyyy catches their eyes / ears. Although, it is a matter of perspective as well. I took a look at Morphing Doodles and in my very honest opinion it's nothing really original or new. there are to many sidewalk / brickwall chalk animations that resemble this and IMO they're all over-rated, fun to watch but still, over-rated. My advice is try to think of something that nobody has thought of yet.
daigonite
I looked at your animations, and while they're quite good, you don't have anything about them that really sticks out. I'd recommend using more sketchy lineart as well as trying something new besides odd parodies.
Best of luck!