Vibraphone Sonata

I wrote this quite awhile ago, but finished it recently. I was going to add more, but I decided not to.



I tried to keep parts within the instrument's ranges, and I think was successful.

I wrote this after listening to a marimba I&E solo. You can check it out here.
https://www.youtube.com/watch?v=O_sK_0FF29M

I require feedback.