I really love how charming this game is. The graphic, the characters, the animations, the dialogs are all great. Most of the puzzles are quite straightforward, not a bad thing though. (The dorm door one did took me awhile but that's only because I was so convinced that the note had something to do with the door's code.) The music was also great.
There are quite a few bugs though:
1. Sometime, the outline of the investigated object persists.
2. You can get stuck on stuffs after jumping on it such as, the sink, the stick bridge in the beginning.
3. You can buy another coffee at the shop for 0 coins after buying once, you can also give the coffee obtained this way to the rat who wanted coffee, which I suspect to be the reason for the next bug.
4. The manager's office won't open for some reason despite completing all 4 quests. The cutscene that is supposed to play before the manager's office open won't trigger either. This happened after I found bug #3.
Great job on this amazing game.