Question about LoZ Twilight for GC

I know this game is a couple years old already, but I was just curious if anyone knows if there is more to it than the initial play-through. I loved this game, and spent about 65 hours on it.
I know I don't have all the items, I only have Zora's Suit and 1 shield, and there is a slot for something else for both, but I don't see a point in collecting more items since I already defeated Ganon without too much trouble. Any knowledge of unlockables or cheats would be helpful! Thanks!
I know I don't have all the items, I only have Zora's Suit and 1 shield, and there is a slot for something else for both, but I don't see a point in collecting more items since I already defeated Ganon without too much trouble. Any knowledge of unlockables or cheats would be helpful! Thanks!