Hm... yeah, that's tough. We tried to make it so that you could put notes into the harps from the sides (i.e. not the part with strings, the solid part), but if that's causing you to bounce too we'll have to think of something else.
Making it a button would fix the problem of accidentally placing a note when you just wanted to use the instrument, but it wouldn't fix the reverse... maybe we could have a button that makes Tonic lean forward a bit so you can place a note without your collision box getting near the harps?
The money at the end is how many coins you collected in the levels - depending on how many you collected, you get a different ending screen, but we're working on different uses for the coins for future versions!