well...
I'm not going to assume you're lying when you say this is your first time animating with flash but I pretty sure I've seen a mock trailer of the same name of this parody a couple years ago.
(Just don't use that line in your authors comments it gives you nothing but sympathy votes and IMO that's just sad.)
I wanna review this fairly but from what I remember the trailer I saw of this was way better then an extended series. It was a brief presentation of the concept of Mario and metalgear mix.
But unlike Super Mario bros Z , (which this is probably inspired by) where AlvinEarthworm uses the theme of dragonball z, you have to rely on the metal gear story more then it needs to so you're basically showing us metalgear again it's not appealing, and not even a parody.
You're not doing anything original copying the dialogue word for word and replacing keynames with mario themes won't cut it for me.
So concept is ok but it doesn't have enough to fuel a series. But don't let this stop you you look like you put alot of work into this so just try to change the dialogue and add something more to it because It's boring to people who have played metal gear and confusing to people who haven't.