This movie had a great mixture of motion tweens along with some frame by frame.
The black kid's tweened walk cycle can be improved upon by considering the complex joints within the body.
The foot alone has a few connecting joints; However the feet are not clearly visible on camera.
Mentioning the joints of the feet is kinda irrelevant for this movie review.
Observe how actual people walk and pay close attention to all the connecting joints in the arms, legs, feet and hands.
You can make better looking walk cycles with a bit of observation and practice.
I like the multiple camera angles utilized for this animated feature.
The sound was very subdued when compared to other movies.
You only used sound effects when they were needed instead of opting for constant noise.
Music can be effective for establishing mood; However, sometimes a more subdued soundtrack in appropriate.
The backgrounds at the playground were significantly better than the downtown area.
A lot of your buildings were mostly squares with crudely drawn doors.
Actual buildings are complex structures in a variety of shapes.
Cities and towns are very hard to draw.
Next time you visit down town.
Take some portable art supplies with you and take the time to observe the buildings.
You'll see a variety of colors along with different building structures.
I see buildings in real life that would make for beautiful backgrounds if faithfully recreated as a drawing.
Practice with drawing everyday objects in your surroundings to make improvements.
I like how you played around with pupils of the eyes to create different facial expressions.
You could also play with the shapes of the eyes themselves to really display emotion in your characters eyes.
Observe how real life people express their emotions with their face for inspiration.
People sometimes make really funny faces whenever their pissed, happy, sad, horny, hungry, ect.
Exaggeration is key for creating lively animation and expressive facial expressions.
I hope this review provides enough information to move you towards improvement.
You made a better first submission than most other people on this site.
-Mightydein