This is one of the best hacks I've ever played. It definitely left me hungry for more and I hope it gets completed.
One of the best things about this is the aesthetics. The music is really great (I stood in place for a minute just so I could listen to that castle theme remix) and the graphics are simply amazing. It didn't deviate from the more detailed style it uses. I also like the HDMA effects used, they're subtle but nice.
There are three things which struck me as odd. The first is one is probably unfixable, and it's how the game halts when it loads in music on the overworld. It's due to how AddmusicK handles things, so this is really just a minor nitpick. Aside from that, the HDMA gradient on the overworld affects the save prompt. There's probably a way to fix that (maybe by disabling the gradient when it's up). In the beginning of the castle, only half of an egg disappeared. I looked in Lunar Magic and eggs seem to just be coins. I don't think that might be the cause of the problem, but it really depends on how they're handled. I doubt it's an HDMA issue, seeing as HDMA gradients only affect the backdrop color register.
Overall, this is an awesome hack. Keep up the good work!