Op5 Nr4 a pioneering work of microtonal piano music

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A brave effort but too close to tonality and the romantic era (occasionally whole tone) and didn't seem microtonal at all until bar 108 for a few bars and a few other places.

I read it as intentionally a piece for computer-performance. Microtonal pianos have been built and it's possible to create an electronic one (on voltage-controlled synthesisers at least by altering the voltage span of the keyboard - but at the expense of compass)

It's a pretty good composition but doesn't explore the possibilities offered by microtones. The opening sounds more like Chopin or Schubert.

Where is it microtonal and how is it "pioneering"?