Don't go in full screen
You are an explorer who is exploring the ocean to catch fish to sell to scientists to learn more about them, then release them back into the depths. However they didn't pay you anything (cheapskates) to upgrade your sub. In this game you have to buy upgrades to get you deeper and deeper into the ocean to get better fish. You can move using the left and right arrow key when you press play. Catch fish by touching them, however, they are fast and will escape you. Do your best and have fun! (all the fish names are in the sprite that says "Extra just in case")