Selim Palmgren, the 'Finnish Chopin', wrote this piece with nuanced chromatic harmonies that lean toward Impressionism. It is characterized by delicate, shimmering textures that evoke a dreamlike state.
Mastering the control of light, fast-moving figurations alongside the melodic line is the central technical task.
Comparable difficulty and character — good candidates for what to learn next.
Berceuse is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Berceuse lasts about 3 minutes.
Berceuse 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 Barcarolle by Selim Palmgren, Calme des jardins by Alice Sauvrezis, Clair de lune by Claude Debussy — see the full similar-pieces list on this page.