These variations utilize a basso ostinato to anchor an expansive set of musical character pieces. It is distinct for its combination of archaic grounding and late-Classical decorative virtuosity.
The performer must maintain rhythmic stability while executing increasingly complex decorative figurations.
Comparable difficulty and character — good candidates for what to learn next.
100 Variations over a Descending Scale (Op.11) 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 100 Variations over a Descending Scale (Op.11) lasts about 15 minutes.
100 Variations over a Descending Scale (Op.11) 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 100 Variations over a Descending Scale by Vaclav Pichl, An introduction, 5 variations and fantasie by João Domingos Bomtempo, Ballade by Joseph Silmon-Clyde — see the full similar-pieces list on this page.