What on earth made you think of that?
A Zebra underwater? :D Nice idea.
Anyway, I really liked this one - ESPECIALLY the introduction, that was really funny. Graphics were good, and it was certainly fun to play, if a little short.
It's a simple design, but you pulled it off. I actually like it better than I think I would have if you'd made it really complicated.
I couldn't see a single issue with it in terms of collisions (which really bug me when they do appear) so well done for getting it right. :)
All in all... Definitely worth a high rating!
Although I am a little biased towards you guys anyway, so...