This iteration by F.C. Costers provides a standard pedagogical study in Romantic phrasing and cantabile playing. Its simplicity of form makes it a useful teaching piece for developing tone production.
Focus on achieving a singing melodic line while keeping the inner voice accompaniment subdued.
Comparable difficulty and character — good candidates for what to learn next.
Au Crépuscule 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 Au Crépuscule lasts about 3 minutes.
Au Crépuscule 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 Au Crépuscule by F.C. Costers, Andantino in C major by Franz Schubert, Au jardin by Théodore Dubois — see the full similar-pieces list on this page.