I have gotten some excellent feedback for the demo, and with that have made a few changes listed below.
Door indicator: There is now an image that shows when you mouse over a door to show that it can be opened.
Font corrections: Some of the fonts were mismatched.
UI adjustments: Putting UI in the appropriate position.
Notebook Cover: Made the notebook directions have a proper background.
Clarification about notebook use and abilities: There was some confusion with this part of the game so I added more directions and an "Are you sure?" box if you don't use all the notes.
Final door bug fix: There was a problem with the final room if both doors were opened. Fixed now.
Slight level layout changes: A few cover positions were rearranged.
Hopefully this makes the demo an even smoother and fun experience! More gameplay tweaks may be made depending on feedback received.
Things to do: Finish localization into Chinese Simplified and Traditional.
Later on: Complete Japanese localization.
If your computer is set to either Chinese or Japanese, I recommend setting it to English for now if you want to try the game. Hopefully this will be resolved soon.
Have fun playing!