Escape the Barrel

Battle your fish brethren to the death to escape the mighty barrel o' fish!

BIG FISH IN A SMALL POND: both literally and figuratively Because you are literally a fish, growing to be bigger than others. But you are figuratively as well, trying to become to best of the bunch and win

BACK TO SQUARE ONE: technically done literally and figuratively aswell. Because when the player dies they return back to original size and are weaker and have less health and return back to the start and they make a joke and the same time saying, 'Oooh, back to square one I see, hehehe'

BOTTOM OF THE BARREL: relevant in the title/lore/description and level design in which the players are trying to literally escape from the bottom of a barrel. By growing bigger.