Played this after playing the creator's second game, Dream of Gluttony, so I will do some comparisons.
First, let's start with what I didn't like:
Imho, the character movement was way too slow. Rabbit effect makes it better, but could be faster. Next, I didn't really like the mazes. Sometimes, the maze maps were just too massive. Wished to have more freedom in exploration for those kind of maps. The pixel art was pretty good at times imho (the eye nurses were great), the other art for full characters was not always that great (some of it was pretty good though), but totally acceptable for a free indie game. Comparing with the next game I can definitely say though that the art did improve, which is very nice to see!
Ok, now with the things I liked:
The story was actually really interesting, once again! I also really liked that the true ending was pretty long and takes its time to give a proper explanation to what is going on. There was also enough foreshadowing, which was subtle enough to not give away the story, but obvious enough to have an a-ha moment later on, which was really nice. Also, the music in the game was really good at times, especially the title music and the music in the art gallery. That D-person (forgot her name) got some talent!
Overall, it's a little difficult for me to give a conclusion. On the one hand, I would not say that this game is a must play. Imho, it didn't even feel very 'Yume Nikki' to me, since it had quite a lot of purpose, ultimately. On the other hand, for me, personally, it was a really interesting game, also because I had played Dream of Gluttony, and because the the story was interesting and also partially connects to the other game (and the green rabbit character is here too!). It is also pretty clear that a lot of effort went into this game. I really liked the music play room at the end, which also shows the extra effort put in by the creator.
So yeah, overall, cool game, and I'm looking forward to the creator's third game! :)