I love your minimalist approach. It definitely adds suspense to the piece. The player knight, skeleton knight, fort, and pallette are my favorite things. The pine trees look a bit too cartoony to match -- maybe they could do with more shadow and needles. The flag is a bit underwhelming also. A big tattered flag rippling in the wind would be much more intimidating. The skeleton archers look a bit unfinished.
Overall, great work. I'd love to see you push it a little more.
I love how you separated the GUI from the playing area... very nice!
I've never been wild about the "bent over pine trees" style but I dig the color choices so I get over it with this piece :)
Cool stuff, I loved the high contrast on the skelatons.
Gavralraw, sure not! Soviet Union 4tw! :) ...a joke, but still not US, just some generic flag.
The sky and forest should be taught as a lesson. The frontal elements sadly don't measure (not that they are bad at all).
Nice mockup man! :)