Well...
Ok, no disrespect, but it's seems that what you did was just grab a bunch of sprites from other games and apply them to your own story. The story is pretty good I must say. But you should create your own characters and stuff. I mean, they were blatently from other games, you didn't even change their names or anything. Get a little more creative when it comes to characters and things like that. Also, I'm sure you could find a better theme song than the "Power Rangers Theme". But besides that it's a good idea and story, just work on you characters and grammar. Also, try a more pixeled font.