Random is cliche.
I can appreciate the animation, but everything else falls flat. I think what is least successful is the humor. Humor that is "random," "zany," or in your words, "doing utterly strange things for no reason," is a tired, lazy, and weak creature that feeds off of outdated memes.
In a way, it's like the work you produced isn't even yours because you took jokes from everywhere else and didn't make any of your own.
You don't have a 4.39 because what you did is quality, you have a 4.39 because Newgrounds is full of 12 year olds who think any referential humor is the most brilliant thing ever.