Good looking game!
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I've never tested Zzzip with the Mouse driver.... I hope it works, because the compiler is EXOS friendly.
You can test if the Mouse driver is already loaded with the 'EXT "help mouse" ' Basic command within an error handler. If it returns EXTYPE=9240(*** Unrecognised command string), then load the driver with the 'EXT "load mouse.xr" ' command (if the Mouse driver file is on the same path).
Loading several instances of the driver is not harmful, but wastes valuable memory. Only the last instance will work, and the loading will close the existing opened mouse channel.
Please, always use the newest version of the Mouse driver, downloaded from the EnterMice wiki link.
I am slowly struggling for improvements....