very cool, I like it a lot already!

there is only one thing that bothered me a little, is the horizontal line you have on the top right part (with two darker pixel on it)
like this I don't really know if it's painted or a crease... for a crease, I think the line should be darker.. I did a small edit,
(edited other stuff more for fun than necessary but maybe will give you ideas ^^)

keep it up, can't wait to see more of this game!
