Original concept and challenging, although I narrowly beat him in the first go. The only thing I would add to this is to have a button to snatch the ball, but fouling or so would give Kim a point. I found the entire game very humourous, and it thoroughly deserves 4.5 stars for a brilliant game that I replayed. I can't give it 5 stars because I don't even give Peacekeeper or Road of the Dead 5 stars, and they have months of effort put into it.
This is also probably the best game with this sort of art style (think it's called retro) ever. You should think about perfecting this rather than following others into the sort of drawn anime art thing-a-ma-jig, because you can really brand this as your own.