This set of variations by Ferdinand Ries showcases the Classical style with idiomatic decorative flourishes common to the era. It is notable for its exploration of a simple melodic theme through evolving virtuosic textures.
The primary challenge is maintaining clarity and evenness during the varied decorative passagework.
Comparable difficulty and character — good candidates for what to learn next.
'La Sentinelle' with Variations (Op.105 No.1) 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 'La Sentinelle' with Variations (Op.105 No.1) lasts about 7 minutes.
'La Sentinelle' with Variations (Op.105 No.1) 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 'The Old Highland Laddie' with Variations by Ferdinand Ries, Waltz No. 2 by Dmitri Shostakovich, 16 Waltzes by Johannes Brahms — see the full similar-pieces list on this page.