Hummel's 'Alla polacca' is a stylistically refined example of the polonaise form from the early 19th century. It showcases brilliant passage work and the composer's characteristic pianistic facility.
The primary challenge lies in the rapid, crisp execution of the sixteenth-note passages while maintaining a regal dance character.
Comparable difficulty and character — good candidates for what to learn next.
Alla polacca is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 6.
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 Alla polacca lasts about 4 minutes.
Alla polacca 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 Capriccio for Piano by Johann Nepomuk Hummel, Assembly Waltz by Johann Nepomuk Hummel, 'S Wonderful by George Gershwin — see the full similar-pieces list on this page.