Pros and cons are down below) Check out my vid here:
Advantages:1. I adore that you put some secret stuff in the game) I was almost dissapointed by normal ending because of the lack of horror elements but then I put a bit more effort into solving the puzzles and I am glad I did that! Btw the window ending made me laugh so hard.
2. The art style is very nice. I wish to see more arts with lavender and other characters. Very beautiful and fairytailish.
Disadvantages:
1. I did not really understand the chess puzzles (maybe I am stupid). But it said that were whites to go - they would lose basically (not so poetic as in the game)) though in the solution you can at least move your pawn. I thought that the riddle implies that there are no possible moves for the whites. Maybe it needs more clarification.
2. I wish the game would have a lot more horror elements. I would be glad to see more lore and explanation on the secret stuff.
Overall: I enjoyed the game a lot! Replayed it 2 times and I glad I did it! I wish this would become a bigger project with a darker story. Though it's been out for years now... Still, can't wait for more)
Hope my feedback was useful!