Will look into it! Fullscreen is the default right now, and Allegro 5 should get the correct size from the system. The 0, 0 are dummy values that I thought would be ignored here. Maybe I should put something like 640, 480 in case they aren't ignored.

In the meantime, you can try one of these command-line parameters to get a better window:

-w                      run windowed at 640x480
--resol=800x600         run windowed at the given resolution
--fullscreen            use software fullscreen mode (good Alt+Tab)
--hardfull=1600x900     use hardware fullscreen at given resolution

The default mode is now fullscreen with 640x480 passed for the command-line parameters. If fullscreen works, Allegro should ignore the given resolution. That should be a fallback for when fullscreen doesn't work. I hope this fixes the tiny window.

Once Lix runs, set the window resolution of your choice in the options menu.

Awesome, no more tiny window!