Different Tuna's papercrafted underwater side-scroller Derrick the Deathfin joins fellow indies Retro City Rampage, Joe Danger 2, and Machinarium as part of this week's PlayStation Store update.

Derrick the Deathfin is a vibrantly colorful action game in which players control Derrick, a recently orphaned shark out for revenge. In Derrick's case, revenge involves destroying ocean-polluting machinery created by humans while eating damn near anything in his path.

Most levels demand that you keep a rapidly-draining hunger gauge filled throughout, meaning that you have to devour fish and collect strength-restoring items as you race toward each level's exit. It's basically a murderous, arcade-style take on Sega's Ecco the Dolphin -- not a bad thing at all!

Derrick the Deathfin is priced at $7.99. PlayStation Plus subscribers can purchase it for $5.59 for a limited time.