Oh, I get it now. To be fair, if the note fell off the screen with my character before the reset I think that would be more than enough to explain it. Yes, it's a bug, but falling off the screen before a reset is a time-honored tradition.
And as for the tutorial, I think the second note threw me off more than anything else. It's impossible to know now, but I think leaving only one note, the one with the arrow, would have made it easier to get it quickly. Still, props for working word-less toturials. Most people here can read English, of course, but it's always nice to see language-independent game.