This is a really nice game, it would be better suitable for kids if you mark somehow the next target. When I press UP + LEFT it's not every time that the diagonal recipient gets targeted. GG!
Thanks so much for playing!
You can only pass the note along the rows and columns of desks, not diagonally. I realize the isometric layout feels a bit confusing, and I'm sorry about that. The illustration of the arrow keys on the instruction screen is a bit of a hint as to how things map - UP moves the note towards the back of the room, DOWN towards the front, and LEFT and RIGHT along each row of desk.