Consider his grace...consider his beauty...consider his left hook. While I can't verify that last statement because frankly the closest I've ever been to Australia was this cute Australian girl in my English class, I'm not one to doubt what years of video games and cartoons have taught me - kangaroos wear boxing gloves. So why should Kao be any different - he's a kangaroo therefore he should have boxing gloves.
The environments Kao roams tend to lean towards the plain and repetitive side. There are a few nice touches, such as leaves swaying on some plants and some neat looking snow, but for the most part things look very formulaic and boring. Kao isn't the best looking kangaroo in the Outback either. His animations are very smooth, but like everything else very simplistic. Unless I am way off on the concept of this game, it seems to want to come across as a cartoon feel - unfortunately, the animations are way to simple to be any help. Kao is supposed to be punching things and his animation for punching should reflect this. I want to see an over-the-top wind up and punch when attacking, not the love taps he gives. Unfortunately, the lack of a good punch animation, or at least some arm-reach with the punch, comes back to haunt the gameplay - but more on that later.
The sound is not the worst I've heard and works with the game, but it's nothing memorable. I did like the 'sliding chime' sound when sliding down a slope.