A non-awkward window size would be one with a size and aspect ratio comparable to those used for the screen itself. So, if the ratio of width over height is anywhere from 1.2 to 2 (based on 1.33 for older screens and 1.77 for current screens). Similarly, if you can find out the actual size of the player's screen that would be good. If not, a default that is only a little smaller than the most common screen resolution (1920 x 1080 last I checked) would be a good compromise. My screen has a weird resolution of 1920x1200, so 1000x1000 plus the OS's toolbar and the window's handle made the game window look like it was trying to fit within half my screen. That feels like a bug, even if it isn't one.