Super Briefly actually sounds exactly like Half-Minute Hero. Except that game gives you 30 seconds and it's a fantasy setting. The core concept is the same though. A villain is casting a spell to end the world, and it takes 30 seconds to cast. You have to perform the requisite RPG quests (find a weapon, obtain transport, defeat random encounters) and then take down the bad guy. If Super Briefly sounded appealing, you might want to check it out. If you don't have a PSP, try the XBLA or Steam versions (which have amazing titles).