WARNING! LONG AND DEEP REVIEW THAT WILL SYSTEMATICALLY HELP IMPROVE YOUR WORK:
Ok. lets start with the most obvious and annoying downside, the animation is dull. There is like no actual animation whats-so-ever. Its just 1 drawing thats tweened heavily. Perhaps next time you could at least apply some frame by frame animation to give more sense to the movement. The only actual movement that i could identify were the eyes when they blink which isn't enough if you want to make a quality cartoon.
Another problem is the subject matter it's self. Why would you make a music video to an unknown song and how did you find the motivation to do it? The plot is both cliche and boring, you need to spread out the main points more and add important detail.
Also the backgrounds were badly drawn. They had all the important detail however the lines were way too thick. I suggest that next time when you draw straight lines for buildings or something, use the line tool, don't use the brush tool. Furthermore, the backgrounds need at least some depth. Try putting some shadows or blurs.
Despite some problems, I actually liked the character design. I know its just plain blobs with eyes but there is something about your art style that made them believable.
This cartoon isn't horrible. I don't know whether this was meant to be a quick test or an actual effort worthy toon but just remember that there is a ton of space for improvement. I hope to see more quality cartoons from you in the future. Just take your time and try your best.