The translation of your alien-looking cipher is:
> I want chocolate. Preferably milk, but white is awesome, too.
----
> I'm thinking of writing a first contact story from the alien POV.
1) "X'Y" is pretty definitely "I'm"
2) ", WZZ." is probably ", too."
From there, the rest pretty much fell into place. It helped that the alphabet was constructed predictably. For example: A, B, and C were all dark circles with a single spike.