It would be good if the player could know which end did he/she get... For example I don't know which one I got... maybe the normal one since I didn't unlock the gallery in the title screen?
Besides I think the mapping was ok, especially in the king teddy's floor: it was well structured and nice to explore >u<! Unfortunately the garden's mapping wasn't that good in my opinion... I think you should put more variety of grasses and trees to make it prettier and more enjoyable to play. I think it was way too empty... You know what I mean? Please don't take it as a bad thing... I only wanted to give you a constructive criticism (You should have seen my older maps... they were awful ToT). I think if you add some sunbeams as an overlay image it would improve the map very much! (I love sunbeams XD)... or maybe some clouds? You know that fog which look like clouds... I don't know if you understand what I mean... But anyway, the mapping was good in general :)
What I liked the most were the characters! Especially... KING TEDDY! XD ... Maybe because I love teddies... especially the talking ones! I hope we will meet him again! I especially liked the charas because each of them had a different personality... some of them, like Megumi and Tomoko, maybe a bit clichè, but it's alright! It doesn't really matter if they are clichè or not, the important thing is that they are interesting and enjoyable, which it was exactly what they were! I personally don't like Megumi though... She always get on my nerves! On the other hand Frederika is way too kind with her... WHY THE HELL DID SHE ACCEPT THAT IT WAS HER FAULT?! I would have given Megumi a punch, if I was her! The best of the group is Isamu... I also find Kage interesting... I hope we will have a chance to talk with her and know her better in part two.
I really liked the fact that you used so much cutscenes (I'm not sure whether they're called like that or not, anyway the pictures which you used sometimes in the game). They were well drawn and made the gameplay more entertaining. I liked them :)
As for the puzzles... some of them were difficult to understand... especially the library one. If I wouldn't have read the walkthrough, I wouldn't have figured it out. I think you should have written a little hint somewhere... As for the piano one, I think it would be better if you make puzzles which everyone can understand... Because for example I personally didn't know that some "english music notes" even exist... But that's only my opinion.
I don't have anything to say about the music and sound effects... I think they were pretty good, and fitting to the given atmosphere.

All in all, your game was really fun to play and I can't wait to know how the story goes on! I hope my feedback will be of help and good luck with part 2! Can't wait to play it! :)