Slightly more wind effect on the trees to match the sound
The sheer strength of the radial blur is a bit much.
Like I used to, you think that a small amount of blur extending the color of the character looks good, but trust me, you want the blur to not touch the character unless it is fully engulfing said character.
For the first character the blur need only be moved a little bit, but for the second one, act as if the camera is a real camera, it should focus on the entire character and his colors and edges should look sharp, otherwise the camera focusing does not work in the animation.
Also, removing the one character's foot from the tree at the start of his movement as it is clipping and does not seem real.
That being said, although the blur is a bit strong in it, the opening shot is very nicely done and the ambient noise is very nice.