It looks great!
I don't know if others have this problem, but the icons in the upper right (tools, history, layers, colors, settings and help) are miniscule -- so small, it's almost impossible to see them.
I think it might have to do with resolution and scaling. I'm using Windows 8 on a laptop with a resolution of 3200x1800 on a 13-inch screen. Windows should scale up everything, but either those icons are not being scaled or if they are, they are simply much smaller than the other icons.
I can provide a screenshot if it helps.