It's always a fun time to see your games! The 3D characters are really nice, and I'm glad to see that you've been building on them. The storytelling here is also fascinating and paced extremely well; Mokou and Keine are characters that I've hardly seen enough of, so it's nice to see them being explored.
On the gameplay side, the puzzles are relatively simple, but the attention to level design is quite good. I remember you talking about the way that you introduced one of the objects' mechanics, just in the case that the player didn't decide to be silly with a foe earlier. That kind of approach always helps a lot with maintaining the game's flow.
This was an excellent experience all around! I look forward to seeing your next project, and what you do with your next game engine!