Wonderful game. As others have said, it reminds me a lot of the Legend of Zelda. I really wish that all of the treasure chests were achievable when you first got to them. Or at the very least, the game provided a map, perhaps with the chests even marked for you as you found them. I really did not want to kill the watcher, and I could tell that the game would likely have more than one ending, but after spending an hour wandering paths I had already taken without finding any additional chests, I gave up and killed him just to see the credits.
Really fun game though. I absolutely loved the lava dungeon. I spent a good twenty minutes trying to get past the part with the melting zig-zag bridge and the chain flail. Fun fun fun. :)