Game shows only blackness

[Mudbill]

The app never crashes, so no Apple log. As far as I know, it never shows anything. I can hear the sounds that it plays through the pre-menu and sticks around the menu. I guess I could try to shut it down normally if I'm lucky enough to navigate to the right button, because the hpl.log hasn't really put forth anything useful so far because I've had to force-shut the app down, which terminates the log in the middle of it.

I can try the shut down in about an hour or two.