I enjoyed it
You put a lot of effort into this and it shows, and your directing skills are definitely improving. It was a good length, and you keep the story interesting, so keep up the good work.
There are a few things I'd like to suggest. One thing that is rather noticeable is your line quality of the characters. A lot of the times they look like the preliminary sketches that you'd use so that you can draw over them. Consider after drawing a character to turn the lines light blue or red, and trace over them again with solid strokes. It will drastically increase your professionalism.
Also, the voice acting was good. Your people do good work. However, I'd watch how they interact with each other, and try to move away from it coming off forced. Such as in the beginning, they all meet up together with a long pause that ends in laughter. Also, yelling to yourself about others while people are most definitely still around seems a bit unbelievable. However, for the most part it seemed pretty well done.
Lastly, and this is just an aside. Maybe work on your color selection. I see you use a lot of unsaturated colors, such as true green true blue, and so on. If you choose a specific color palette, it'll look more unified. Such as earth tones, blues, reds, greens. It makes it easier to animate with a more limited color palette, but also makes it look more believable.
This is a pretty long review, so I'll end it here. Good work, and keep it going. You're improving, and I'm looking forward to seeing where you take this. Take it easy.