A cute little game that is programmed well, I liked it! Cute premise, cute style. I had two major feedback notes while playing:
I had a little issue opening and closing menus at times, they don't close if you try to change areas with them still open and sometimes don't let you switch areas, just little bugs like that that probably aren't hard to remove
For the mystery, fundamentally you only really need the classroom note to solve it, because only one character has an "E" as the second letter in their name, revealing who signed the note by just that; more similarly named characters would alleviate that. It would be more engaging if the miscellaneous clues added to the mystery, but I did like the robot sidequest, it was cute :)