Weeeell
As it's been said for a first flash I think it is well done. Of course that doesn't automatically make it "OMG AMAZING" but compared to the stupid things people usually make without putting effort into anything you are doing well.
Now then, there is nothing wrong with having no sound, I know how hard it is to get it myself.
I would advise practicing on frame by frame animation, it takes alot more work but of course it comes out better.
And you are relying a little too heavily and internet "funny" slang phrases like "ZOMG PL0X" and all that. It can be amusing when used cleverly but you are on the verge of excess/annoying.
It was still a bit amusing, as someone who once played runescape. So I'd say you have a general idea of what you are doing and are already at a certain level of qualiy on your very first flash. Keep at it.