Haha, it somehow has a small amount of charm despite the obvious flaws. The biggest concern is the fact that the stickman changes thickness as he jumps.

Good start friend.
Ha, and he still scored.

Work on your cleanup and consistency. Once animated the actors bodies deformed an became thicker. Once you have that process streamlined work on scenes, character/animation definition, and storyboard(Who are they, why are they playing soccer, what happens next? I know it was random, but you're in a sea of animators publishing similar content)

With all this on top of what you already are capable of, you will definitely become a master animator.