Meh
I'm starting to dislike sprite animation more and more, especially the ones that come in many parts with months intween.
I have to admit tho, the sprites you drew yourself were really good, and the animation was great (!) aswell. Very fluent, and not choppy, which is very refreshing to see in a Mario sprite movie.
What's NOT refreshing tho, is another adaption of the Super Mario Brothers adventure in a sprite flash movie. Go to the Mario collection page, there are dozens of these, some better, most inferior.
This movie could stand out more if you made your fightscenes more.. explosive.
Dont get me wrong, I liked the punching (well animated) and the little fight with the Hammer Brothers, but it just felt more like a warm up fight. Like one Mario & Luigi could easily win, especially with the prospect of fighting Bowser and all of his far superior children.
I was really disappointed Luigi had to die here, also because I always liked him better. But like I read in another review, bringing him back in a crucial moment would be sort of cliché. It'd be cooler if Mario had to train to avenge his brother. Also, Mario seemed hardly phased by Luigi's death. Anyways..
Extra points for the voice acting in the beginning, I liked the opening scene, tho it's weird there are two play buttons..
Also, please get rid of the edges that say "Presented by Newgrounds". It's annoying. Put it in the loading screen or something if you're afraid of thieves.
Holy shit this was long.
Okay, in short, you did well, just not really my cup of tea, and it really needs a little extra something.
Cheers