It's been a while
I've been waiting to see this second episode after your previous ones for quite a while. But it was worth the wait. Here's my review:
Graphics: I like the custom sprites, even if they aren't exactly perfect. But I know they took a while to make though. The movement was pretty well animated, But I really think you should try using the Vcam in future, since it really helps with panning and zooming. Trust me on this one.
Style: Although I do like the style. It does remind me a lot of SQFP, But you have added a bit of your own style to it, so it hasn't affected your score that much.
Sound: The sounds and music were very clear. But some of the music loops need a little work.
Violence: Not quite as much violence. But I can't exactly complain. The fight between Mario/Luigi/ Yoshi vs Bowser/Shadow/Mecha Shadow was awesome.
Interactivity: Buttons for the start and scene select. As well as space bar functionality for the dialogue. Gets a 5 because their isn't much interactivity in movies anyway.
Humour: Some funny bits thrown in for good measure. I liked the part when Mario dragged Luigi along with him. Very similar to parts in my SMBZ series. XD
Overall: A great use of sprites, original storyline and plenty of action. I just hope the next part is even better.