Okay, had the chance to download and explore this properly now.
Oh it's magical.
Some comments on each element of this.
Yokai
Two stand-out elements of this coaster to me were the Immelmann (notice you've called that a cutback in your elements list?) and the wingover into the helix. Adored the glide out over the water on the Immelmann, and the shaping of the wingover is what I hope all B&M's are like.
Trackwork, supports, extra elements (noticed the sensors, little extra details on the lift hill, etc), were all stunning, of course.
I liked the theming too. The station building was impressive, and beautiful. It was particularly cool setting with the entrance plaza and the coaster(s) just surrounding you.
Ikuchi
Another magnificent coaster. Truthfully nothing picked out as a particular stand-out part, but as a complete package this was great. I loved how the first section minced around with Yokai, and then of course the sideways hill and twisty end.
As above, and almost need not be said, but the actual 'build' of this was to the same high standard I would expect from you.
Whilst the building for Yokai is more imposing and probably the better station, the queue for Ikuchi wins for me. I particularly loved the path scooting round the lake away from everything. A very different feel of station building, and it worked well.
Land
Ran out of ideas of what to call this, but using this to encompass everything that's 'not the creds'. Walking through the entrance archway and hearing the music fade in was brilliant, and I loved the music carried on (fading in and out as you moved around) throughout the park.
All of the theming details in the shops/loos/stations etc was impeccable, and I only noticed at the end of walking around that there was the lower area by the water.
I bet with a few restaurants and a bar down by the water this'd be a quality place to spend an afternoon.
Good god I want this to exist.