Goal is to make as much score as you can. Use your keyboard "up" and "down" buttons to control the fish.
The black boxes help you to prevent collision with the right wall, but
if you stay too much in front of a box, you will be hit by the left
wall; also watch out for the city, don't get too down, as you may lose
health as well as you lose when you hit the upper wall. So the main
idea is to survive as much as possible.
When your health is too low, you may increase it by hitting health pack
witch automatically gives you 100 hp.
Also, watch out for the green boxes because you lose 10 hp after each
time you hit them.
Notice that your score increases slower when you are on a cube than
when you are flying free.
