I will admit I appreciate the fact you're open to criticism as most folks are not. So with that said, obviously this has problems:

1. Nothing really felt authentic with the art in general. Almost everything seemed like it was nothing more than copying and pasting. Even the character designs look like that due to there being some white line around their limbs. I can't say if you been copying everything or not. If so, learn to draw out your characters, props, etc. And if you are not, then be careful on how you draw.
2. Speaking of drawing, please make at least a few more backgrounds instead of just using the same one in different shots. Especially at the end with everybody outside. It makes you look lazy.
3. There are some parts that went on for too long, especially with that awkward black joke. 13 seconds of dead air is not funny.
4. I recommend you learn how to do animation fps instead of tweening everything. Although I have seen tween animation done good before, this is not how to do it. So please try a different animation style.

Now I do give you a 2/5 rating because there is some good in this. The voice acting is good-ish for the most part, although I think it could be improved with the help of Audacity. And the lip-sync is actually pretty spot on! But that's really about it. Everything else holds you back. Now I understand you are a beginner animator, so please take my advice and try to improve. You do have potential, so I really hope you make good quality in the near future. Good luck!