So I see that you already have what is commonly called a diploma of Sound Production or Audio Engineering.
From your demo, you have grasped the concepts of implementation, sound design, mixing.
I'd say go for the job, and try to complete the degree portion of your course as a part time. Don't give up a good opportunity. What you will learn on the job may be far more valuable than sitting in academia for another year and hoping the same opportunity arrises again.
I hold a diploma in audio engineering, but I also have a software engineering degree and 8 years of software industry experience, so for me game implementation side of things is easy to learn and pickup from attending GDCs, watching and reading media.
My job prospects have been through past job experience combined with self learning. Do try to complete your degree portion if you feel the skills you will learn there are beneficial to you or even just for your own feather in the cap.