If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Throw the bombs to kill the fishes and grab them with your boat. Attain target in each level within the given time duration and upgrade the boat with bombs to do some fishing. Grab the killed fishes before the bird takes.
Use arrow keys to move the boat.
Use space bar to throw the bomb.
To select the bomb, press 1, 2 or 3 on your keyboard.