Don't be afraid to unleash the game's items upon your adversaries, as these things do an excellent job turning the proverbial tide.
Shuriken (200 Pearls): A pack of five. Use to hit several enemies at once.
Sushi (400 Pearls): A pack of three sushis. Makes Squids hit stronger while restoring some health and stamina.
Cocktail (600 Pearls): A pack of three cocktails. Restores stamina, some health and abilities.
Explosive Jellyfish (500 Pearls): A pack of five. Packs an explosive punch.
Tentacle Grip (500 Pearls): A pack of three tentacles that revive the last Squid that fell into a hole.
Miracle Tentacle (1,000 Pearls): A pack of three tentacles that revives the last KO'ed Squid, or one that fell into a hole.
Mighty Kraken (1,000 Pearls): Summon this beast to weaken enemies.
Pearlfish (4,500 Pearls): Doubles the pearls you collect in battle.