Readme.txt has written
Command line parameters (order does not matter):
-full / -fullscreen (Run in full-screen mode)
-win / -windowed (Run in windowed mode [Default])
-dx / -directx (Use DirectX [Windows only])
-gl / -opengl (Use OpenGL)
-16bit (Use 16 bit colordepth)
-24bit (Use 24 bit colordepth)
-32bit (Use 32 bit colordepth)
-w X (Screen resolution width [Default: 640])
-h Y (Screen resolution height [Default: 480])