Going against the principles of "graphics aren't everything" and while I accept that we can't all be Pablo Picasso, I really think you need to make it a bit prettier.
The whole GUI thing looks like an afterthought/placeholder graphics. The bit on the left is very plain and boring, and has no fewer than four different fonts in it, which doesn't make it look better - it just makes every element look detached from everything else.
You should also think about doing something with the game area background, like putting a picture or at least a texture of some sort in it.
If you weren't charging $15 for the full version, you would probably have gotten away with it the way it is.
The whole GUI thing looks like an afterthought/placeholder graphics. The bit on the left is very plain and boring, and has no fewer than four different fonts in it, which doesn't make it look better - it just makes every element look detached from everything else.
You should also think about doing something with the game area background, like putting a picture or at least a texture of some sort in it.
If you weren't charging $15 for the full version, you would probably have gotten away with it the way it is.