Ferruccio Volpatti's work is a minor-key miniature focused on expressive melody and mood. It is musically distinctive for its clear, hymn-like harmonic progression and straightforward structure.
The primary challenge is to sustain a singing tone throughout the phrases while observing the subtle harmonic shifts.
Comparable difficulty and character — good candidates for what to learn next.
Au gré des heures is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 5.
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 Au gré des heures lasts about 3 minutes.
Au gré des heures 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 Gymnopédie No. 1 by Erik Satie, Gymnopédie No. 2 by Erik Satie, Gymnopédie No. 3 by Erik Satie — see the full similar-pieces list on this page.