Poor Lilly. She's been a nonexistent cabinet for the last 600 years...
Design, style, music, I can't think of a single thing that feels out of place here. There's some balance issues as others have mentioned, but if balance is the only thing holding you back, you have a great game on your hands. I'm most impressed by the (I'm sure custom) models so that the camera follows the build in 3D space. That's such a nice touch that makes it feel like an actual item being built instead of just some mouse clicks.
Great job!