I ended up going out Friday morning, buying a second copy, and then returning my original copy after it arrived. Which, considering it didn't arrive until TUESDAY, I think ended up being a good decision. I would have been so upset if I'd been waiting the whole weekend before getting it in hand!
Anyway, I also finished the game Tuesday. Not perfect of course, but overall I loved it! Definitely have a lot of questions on the lore side of things that I'm not ready to dig into yet. I'm still not crazy for the graphical style any more than I was for Link's Awakening, but I do think it works a bit better here. And I really enjoyed a lot of what they did on the gameplay and story side of things.
As of watching the credits roll for the first time without having looked up anything, I missed 2 echoes, 2 stamps, 1 outfit, 1 accessory, and 14 might crystals. Had everything else, including all hearts, side quests, and possible smoothie ingredient combos registered. I've since completed the rest.