Very funny! good job
A good story.
Character designs look kind of clunky.
That sneaky Waluigi.
It's better than some of the ones they accepted. Though I suppose it's a little less directly "Smash Bros" than some of them, what with the CD-i references and meme inclusions. Doesn't hurt the quality, but I figure that & its pacing may be what kept it from being accepted. It seems like a slower, more of its own thing-sort of animation. Where Smash Collab was mostly mile-a-minute skits.
Anyway, the way they were being tactical and hiding out and so on was a good idea, I haven't seen that from something Smash-based before. Mario & his voice/demeanor were handled well, too. Most of this was pretty well drawn & animated and damn funny so I have no complaints.