There isn't that much going on in this cartoon. It mostly fails because the artwork isn't that good. I guess it's a bit nice to see a stick rendition of the Mario characters, but nothing really comes of it. The quality seems low, and I think it might have been better if you had put it in a smaller piece. I would know how that can affect the resolution. What's also weak is how this doesn't seem to be anything that much out of the ordinary.
I would like the stickman to use his shape to his advantage. Maybe have him go through tight spaces or something? I will give you credit for having a nice ending with the trollface and scat man song. I wish I could tell you how to not make it an infinite loop. There could have been more shadings with the colors too.