Another piece with a non-standard key signature.
Originally I tried this with three flats, Bb, Gb & Ab, but that resulted in two of the diatonic chords being augmented, one diminished and one unclassifiable (E, Gb, Bb) so I removed the Gb and that dropped the augmented and unclassifiable one, making the composition more manageable.
Perfect melody, very approachable key signature.