Well, the second boss was ridiculously easy compared to the first one. It didn't follow the Nintendo Rule of Three, but it still had a pretty obvious pattern to it and the means to defeating it was obvious. Still, it was a memorable fight the way the arena was laid out. If there was a heart piece in that dungeon, though, like there was in the first dungeon, I missed it. I can't think of where it could have been hiding, though. The dungeon overall was pretty straightforward, though I had to consult the map at one point to find the way forward.
I also found the Treasure medal in a Goddess chest up in the Sky World, which has noticeably increased the number of drops I've found. Useful. It's a pity that you have so few slots for holding these items.
EDIT: Unfortunately, as much as I am enjoying this game, the sheer amount of redundant text you have to page through is ridiculous, even by Zelda standards. EVERY time I grab a new inventory item on a fresh boot, up comes the informational text. The same for rupees, shop keepers, etc. It really gets annoying really quickly. I'll never understand why Nintendo has made Zelda such a series based on puzzles, and yet continually treats the player like an idiot.