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Because there isn't a command in your script to create an icon for your game. :)

Have you got an icon in your CDROM?
If yes and its a .ico, use this command in your script:

convert "$CDROM/NAME.ico" -geometry 32x32 "$REPERTOIRE/icones/32/$GAMENAME"

OR if the game's icon is in ~/.local/share/icon and not in your CDROM, you must to check if her size is 32x32 pixels. But, the name is different when you install the game so give me the name in your ~/.local/share/icon and I could give you the command.

Sorry for my english, i'm french scriptor :)

If yes and its a .ico, use this command in your script:

it doesn't always has to be ico

Yes I know NLSW, it's an example :)