Did I just play a Little Big Planet level?
It's certainly still fun, but I think I've played this exact thing in one of the custom made LBP survival levels. The one comment I really end up with is that I didn't have better instructions when starting this game. You had little popup windows as new things were encountered, which was great, but when I suddenly saw a warning message on the right side of the screen I wasn't sure exactly what it meant. I thought it meant the shark was coming back (I'd just bombed him), and it turned out it did... but on the other side of the screen? Yeah, needed a bit more warning on that one.