My score: 525
Bullshit you never played Nanaca Crash. Bull-shit.
Anyway, the reason it's not as good as the version you're ripping off (Because you are, and stop whining) is because there's no control once the cat's out of the bag, er, cannon. And once you see the cat interact with each object, there's no reason left to play. No secret hidden specials, I presume. Oh well.
The one thing it has over Nanaca Crash is violence being put upon cats. I hate cats. However, yours is not the first Kitten Cannon, either.
If you want a score based on the quality of your work and NOT based on how it compares to something very similar (but higher budget and better), then do something original! 4/5