1. There is a button located on your keyboard called ENTER. Learn to use it.
2. Your art is subpar at best. Can improvements be made. Sure. Will people leave you constructive criticism? Yes. Will people be highly critical of your work? Yes. Why? Because Newgrounds is a place where creative people grow. There is a reason why we are better than YouTube and DeviantArt. You won't see this kind of criticism there because the audiences there have low attention spans.
3. I'm not knocking any creator who also publishes their works on YouTube or makes something short. It's just that's where that audience is right now. Where the mainstream is at its current time. Here on Newgrounds, it is not only entertainment and anything can gain recognition in some way shape or form. Some of my favorites on here are just that. Weird and crude. Like these...
I'm not gonna be too critical on them, because they were made this way on purpose with this intent. I'm certainly not going to put them on a pedestal high above some of the greatest works here.
To put it bluntly. Criticism will come at you. Both positive, negative, and constructive. Overall though it is important to look at what people are saying and see how you can improve. Even from the negative criticism. It is hard to give people what they want without asking. You risk a lot when you put your works out there. You have to accept that you may lose.
Newgrounds is critical. It is though a place where you can become better. If you want to stagnate and have the easy path, then that's fine. You will hit your peak, people will tire of your work, you'll have a small dedicated fanbase, and then you will disappear into obscurity wondering why people stopped following you.
Then again, you can stay here and receive the criticism and advice given to you. Then you can amass more people to you grow as a creator.
Also learn how to speak to other people. I have a feeling if you become popular and one person doesn't like what you do, you will lash out at them and your downward spiral will begin.