This was a very good animation! Here are the things I really noticed;

-Fluent animation
-Cutesy character design
-The fact that it's for #Let'sSuperMario
-Well timed sound effects

These are some of the things I really liked about this, now for a little bit of what I found "ehhh..."

-Where did the cute character go?
-Loud music, could be a little more quiet.

That's really it! You know you're doing something right if the reviewer can't find very many flaws, even if they look really hard! I rate 4.5 stars. Keep up the good work!