Not bad.
Sprite movies...These have to be good for me to personally like them and this was ok, but nothing spectacular. I can see this is your first submission so i guess i can cut you some slack. My first question is why? Why did Mario and Samus suddenly fight on a Metroid based homeworld, doesnt really make any sense. You need to work on storylines. :)
Graphically this was good, sprites usually look good and its hard to make a sprite look out of proportion or badly coloured so theres not much i can say about this in the way of graphics. The animation was decent enough, could of been a bit smoother in the running and jumping though. One thing that bothered me is Samus seemed to be running really slow. :P
I liked the speech, putting the dialogue in those litle boxes looks far more professional than speech bubbles and such. Makes it much easier to read as well.
The sound was good, music is fast paced and fits well witht he panicked start, and the classic metroid music is good too. The sound effects are great, put in well and they all fit great. I especially liked the sound of Samus's gun clicking as it was empty, and Mario's fireballs. Also i liked the explosions :P
Overall not a bad sprite flash for a beginner, you need to work slightly on your animation and also on your plot and basic storyline, otherwise its hard to keep people watching. But i liked it. :)
Graphics - 7
Animation - 6
Sound - 8
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