This is way too unassuming. You open really strongly, although solo voice, especially when repeated, needs to be backed up a second time. The rest of the piece, while interesting harmonically at times (5:08), never seems to climax (or even build, really) and never seems to leave F major (or F lydian, in the longer phrases). Nothing builds on itself and nothing changes according to standard planning. Brief attempts at counterpoint result in major 7ths and minor 9ths that resolve incorrectly and don't bring out the melody as much.
It's a perfect foundation for building on, but as it stands there needs to be a lot more ebb and flow, rises and falls, to really make this energetic and impactful.