Add fullscreen option
Seems like the games i have tried in GNOME often don't have a fullscreen option. I don't know why that is but i would think a game like Nibbles would be nice to be able to play fullscreen wihout having to look at the GNOME top bar and Nibbles window title bar.
And hide the cursor.
And then being able to press Esc/F11 to leave fullscreen.