This is a contemporary lyrical miniature focused on expressive melody. It is distinctive for its adherence to a singing tone over a modern harmonic landscape.
The primary challenge is maintaining a consistent, projected melody line while balancing the supporting accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
Cantabile (Op.13) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Cantabile (Op.13) lasts about 3 minutes.
Cantabile (Op.13) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Allegro Moderato by Kingshuk Chakravorty, Black Beauty by Duke Ellington, Albumblatt für Clara Schumann by Johannes Brahms — see the full similar-pieces list on this page.