The graphics are really simple but awesome. The sound design is also really nice. This is a super cool concept and is executed really well. The visuals and mechanics for the sharks eating blocks of the islands are really well done. My only problem with the game is that it's a bit too easy. I was able to survive without any cannons or anything on level 12 just by poking sharks before they could eat the last bit of land. But it's much better to be too easy than too hard :)
Overall, an excellent game!