Done that. I'll pm you from now on, I shouldn't really be asking for hints in your game thread 
EDIT Okay. Done. Not sure if these things were brought up but here's some notes I took:
Sometimes doors both open and shut before you go through them.
Bottom Drawers were called "Bottom Draws"
You use the 'walk' icon to go down the manhole and get on top of the boxes...but the 'use' icon to go up and down the stairs? This confused me and took me forever to figure out, as I assumed it would be the other way around. Also, it looks very silly to have him walking up and down the ladder, perhaps he should just transfer between the rooms without needing to go up and down it? (ie. make it so he walks to the ladder when he uses it, then the room changes.)
Having the player constantly walk to an object when using/looking at it only to do nothing and have no comment on it was very annoying.
After you place the symbol from the cupboard into the golden circle, it's possible to go back and get another one.
Sometimes you can phase through doors, the character can click 'use' on a door and simply be in the next room without walking to the door first.
To me, the stairs indicated that they were the way to the front door, and it was only until I tried 'using' the stairs that I realized the front door must be on the fourth wall. It would be nice if this were indicated more clearly.
The word 'I' wasn't capitalized in one spot (can't remember where) and you combined the words 'sit' and 'down' when he tries to take extra books in the library.
When the man first chases you, you can run into the art room, wait for him to come in, then run by him again. If you do this, there's a glitch where the character shouts 'no stay back' etc. again, and the guy chasing him respawns down at the other end of the hall.
Don't know if you meant to leave this in, but if you press ESC at any point, you can bring up the default AGS game menu, where you can significantly mess with the game's speed.
Now, these are all simply things I noticed and suggestions and it is by no means a bad game, I just think if these things were looked into it could be even better.

EDIT Okay. Done. Not sure if these things were brought up but here's some notes I took:
Spoiler
Sometimes doors both open and shut before you go through them.
Bottom Drawers were called "Bottom Draws"
You use the 'walk' icon to go down the manhole and get on top of the boxes...but the 'use' icon to go up and down the stairs? This confused me and took me forever to figure out, as I assumed it would be the other way around. Also, it looks very silly to have him walking up and down the ladder, perhaps he should just transfer between the rooms without needing to go up and down it? (ie. make it so he walks to the ladder when he uses it, then the room changes.)
Having the player constantly walk to an object when using/looking at it only to do nothing and have no comment on it was very annoying.
After you place the symbol from the cupboard into the golden circle, it's possible to go back and get another one.
Sometimes you can phase through doors, the character can click 'use' on a door and simply be in the next room without walking to the door first.
To me, the stairs indicated that they were the way to the front door, and it was only until I tried 'using' the stairs that I realized the front door must be on the fourth wall. It would be nice if this were indicated more clearly.
The word 'I' wasn't capitalized in one spot (can't remember where) and you combined the words 'sit' and 'down' when he tries to take extra books in the library.
When the man first chases you, you can run into the art room, wait for him to come in, then run by him again. If you do this, there's a glitch where the character shouts 'no stay back' etc. again, and the guy chasing him respawns down at the other end of the hall.
Don't know if you meant to leave this in, but if you press ESC at any point, you can bring up the default AGS game menu, where you can significantly mess with the game's speed.
[close]
Now, these are all simply things I noticed and suggestions and it is by no means a bad game, I just think if these things were looked into it could be even better.