OK hear me out: A cod fish...... but BAZOOKA
I really like the flat art style of it! The background flying all over the place when shooting is a nice touch! I did not manage to finish the game (probably that room with all the piranhas in glass tubes takes all of my HP), but it is relatively balanced.
The bazooka can be tricky to aim, due to the fact that you can only aim forward. If you put your mouse behind your cod, the aiming doesn't feel natural to me. Music is good, but a little on the repetitive side.
Apart from those nitpicks, great entry!