Don't listen to the "shit" guy.
For a first animation, this is actually very good. I've been on the Newgrounds portal for yonks now, and I've seen some abysmally crap come through here (and subsequently blammed it) - stick men driving in grey boxes and shooting strange triangles and the like. Considering this is your first, it is actually a pretty decent attempt. You have great potential, and you can work with gradients to quite good effect (although, admittedly, some people see this as "cheating"). Basically keep improving and we can hope see some good quality animations from you soon :)