Goldfish

To be honest I haven't played many roguelikes but I think that's quite an original theme for it - you being a goldfish that gets caught by fishermen and trade wishes (i.e. quests) for your freedom. For some reason this premise has made me want to play this game in comparison to the classic fantasy mighty-hero-in-a-tolkinesque-land-blah-blah-zzz theme. Although it all boils down to ascii art and exactly the same gameplay (save that you have to find oxygen bubbles to regain your breath frequently), it's, I dunno, fun! So get grindin' :).