It's impossible!! Can I have some general gaming hints please?!

Sure! This is how you win:

Firstly move towards the Kangaroo so that you are just close enough

to punch. Now start punching!

As soon as you see Kanga start to bounce up and down (this means

a kick is coming) - RUN AWAY!! After the Kanga kicks - go back in

and start punching some more. But beware - the Kanga may kick again!

Basically, keep this up until you defeat the Kangaroo. Good Luck, mate!