Keep it up
My first animation was horrible, but it survived for one major reason. It told a story, and it was serious. Two things there is NOT enough of on newgrounds. I feel you have taken a step in the right direction, although I didn’t much like the song choice, but that’s more of a personal preference thing.
People are going to bash it, and people are going to love it. Just let the positive reviews be your encouragement, and move on to trying to make the next one better than the last.