This game is really cool so far, but I can't find the third to last note, and it seems I'm not allowed into the tunnel until I find it?
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Well hey there! Thanks for giving it a play!
I realized I didn't include any puzzle/note information in the game guide, so I've gone and updated that, but if you want to avoid spoilers, I'll just throw a little hint here. The 12th and 14th notes are found in "dad's office". Dad's office, however, cannot be entered again after you've left.
You don't need all the notes to enter the tunnel, however you can't enter the tunnel until the end of the game. If it won't let you enter the tunnel, it means you aren't there yet. :)