Let's see...
Well, you're right. It's nice not to see the usual suspects, like Sonic and Mario. But a Sailor Moon/DBZ crossover is far from original. Plus the story is pretty generic, "bad guy shows up, want's powerful item good guys have."
Your animation and your sprite quality suck ass, but that's something that will improve with experience. A few things to watch out for. Make bigger text boxes, because when the characters said a lot, you compacted the text to fit into the box and it was kind of hard to read. And there were a few frames with text boxes that you forgot to program it to stop, so it just skipped the text box.
A far as your grammar, if english isn't your primary language, then I can forgive. But if it is your primary language then there is no excuse for grammar that bad.