I cannot reproduce this on my system, which is fast enough and has real OpenGL drivers. It handles SIGTERM, it shows graphics, shows window title.
It grabs the mouse, yes. But here it also has focus when it does that. You can escape it with pressing esc (if your system is juicy enough to run the game and the window is visible and handles input). Man page description is correct, except on "great fun" *smirk*. Package description should indeed be updated to notify the user of it being heavy and in need of OpenGL. -- Petri Latvala
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