Just one thing, fullscreen works although with black borders, it would be great if we could set the size of those borders in a config file somewhere, or even in the menu (create an "Advanced..." sub-menu) Or make it a hotkey, whatever is easier for you.
And then there's windowed mode but it is too small. I usually make use of a tool called DxWnd to scale up games with small windows like that, but this time it did not work. What kind of renderer this game uses? Is it DirectX at all? SDL? Or even WinG32? DxWnd is able to scale-up and stretch games to fit whatever size you choose, I use that tool to play games like Simcity3000 and Caesar3, finally I can play those games in a big window without having to conform to small-unreadable text.
If there was a hotkey to resize the game's window size, it would be great as well! (I suspect this would be the less cumbersome solution)