GAME:
  Okay the game was bad,let me explain.  What happens is you try to defeat jaws in a scuba divers perspective. So at random you end up going into the game. It has no story or plot of any sort. You don't even know what to do. Anyway at random your ship gets hit at a every 3 or so spaces.
  It bring you into a 2D shooter a scuba diver. You have to shoot and kill jellyfish and sting rays with endless supply of bullets until you go back in the boat. Sounds fun right? Well no, it happens all the time and not just that but it is all you do. You have to keep going from fishing port to fishing port and upgrading you're ship by spending the currency of shells. It gets old really fast.
  Sometimes this thing called bonus stages happen It's when you do something else then shoot fish as a scuba diver. Instead you will be a submarine which is the exact same as the scuba diver but as a submarine. Well that's not all you can also become a plane that shoots down bombs which is kinda entertaining.
  Okay, once you upgrade you're ship you're ready to fight Jaws it is what you been waiting for the entire game but all you get is the same stuff that is when you get shells. There is no challenge to it he just has alot of health. Once you get rid of all of his power you get in this cheesy battle where you stab jaws with the tips of the boat.
  ADDICTIVENESS:
  The game is fun for the first ten minuets but after words it gets really boring that most people never even got to see the end. It was the same old thing over and over again with no new exciting features.
  SOUND:
  It was a awful high pitch sound as the gun which I got so sick of I decided to turn the game on mute ,(nuff,said).
  GRAPHICS:
  There the same as any other NES. the animation was quit lame and there was not that much to the  game to make the cool graphics stand out. The ship battle at the end was atule pretty good for the time but I don't see why the whole game wasn't like that.
  DEPTH: It had shells,sharks,jellyfish,stars,stingrays, and jaws. The map layout was very dull and never had anything that was interesting.
   DIFFICULTY:
   The game had no difficulty it was just a 2D shooter as a scuba diver shooting fish. Sometimes I died but it was maby because of being board. They fish were all the same except that the jellyfish came from the ground and Jaws had a crap ton of health. The only challenging part was the end when you fight Jaws after all of his power goes down. You have to hit him with just the right timing to knock him down. 
   SHOULD I BUY GAME:
    I don't like this type of game , but if you like it go buy it and enjoy.
   

Agartha : This is a good review and I like that what you covered was completely covered. I can definitely see things you missed. Most people could beat this game in 5 minutes and the only reason I think anyone would miss the ending would be if someone quit the game. The gameplay could possibly be explained too. It is still good. I hope this helps for future references.