I;d say a window menu, is a must, with the following minimum options:
Configure Input
Main Sound Volume
Sound Effects Volume
Default Size
(Possible nest those in a Prefs menu)
Default Keys -> Displays all the keys for adjusting the window, such as F5, F10, so that a player can have a reminder.
Pause
Quit -> On separate menu list, with 'Are you sure?' dialogue.
Clicking anywhere in the window, could also work to pause the game
Configure Input
Main Sound Volume
Sound Effects Volume
Default Size
(Possible nest those in a Prefs menu)
Default Keys -> Displays all the keys for adjusting the window, such as F5, F10, so that a player can have a reminder.
Pause
Quit -> On separate menu list, with 'Are you sure?' dialogue.
Clicking anywhere in the window, could also work to pause the game