It's nice, and you've definetely mastered the acrostic. I don't love it, but that seems to be more the fault of the format than anything else.
In parts, I felt you were a bit restricted by this, and it was kind of like it was the format writing the poem.E.g: I'm not sure that "various colours" is right given that there are only two covers. It just sounded a little odd to me.
Also, when you said "In between two thick covers" it sounded like the book was closed, so, the letters wouldn't be able to glare at you because they wouldn't be able to see you.
On the upside, I felt that you laid your thoughts out well, and I liked how the ending trailed off.
