nice tune!
for future reference, since the topic of tunings is a little (very) opaque:
the idea of this major is to use notes outside of the 12 chromatic pitches we're used to. the way we usually do music, especially reinforced by the layout of the piano, is sometimes referred to as 12EDO (Equal Divisions of the Octave) or 12TET (12-Tone Equal Temperament). the B minor scale is a subset of that 12TET set that breaks down the octave into 12 evenly spaced intervals.
an example of something outside of 12TET might be using quarter tones (half flats/half sharps) to split the octave into 24 equal divisions, which is pretty doable in something like FL by adjusting some notes by 50 cents. some tools like Renoise or Osctet let you define your own tuning systems or import others'.
i hope you don't feel discouraged, this is a fun tune!