As far as I know, that looks pretty reasonable for accordion... it'd have to be a big one though. Like, somewhat uncommonly big. I'd recommend checking some out; some ones don't have a huge keyboard. Chords would be better written in tablature.
It sounded nice with the exception of many enharmonic tones clashing... a very difficult thing to mitigate in counterpoint. Most of the time, when it happens, the difference is a major second, and typically doesn't resolve correctly, hence the awkward sound.
That's not super common though. Otherwise it was pretty okay.