This is a substantial Romantic character piece by the Dutch composer Julius Röntgen. It is distinguished by its dense harmonic language and dramatic shifts in intensity typical of late 19th-century piano writing.
The primary challenge lies in managing the thick, layered textures while maintaining a singing tone in the melodic lines.
Comparable difficulty and character — good candidates for what to learn next.
Ballade in D moll is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 Ballade in D moll lasts about 6 minutes.
Ballade in D moll 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 Ballade No.1 by Julius Röntgen, Buiten by Julius Röntgen, 'Ch'io mi scordi di te?' by Wolfgang Amadeus Mozart — see the full similar-pieces list on this page.