Johann Friedrich Kranz wrote in a style that bridge the late-Classical and early-Romantic periods. This Allegretto serves as a study in poise, balance, and graceful execution.
Ensure the short trills are executed cleanly and strictly in time within the established pulse.
Comparable difficulty and character — good candidates for what to learn next.
Allegretto in B-flat major is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Allegretto in B-flat major lasts about 2 minutes.
Allegretto in B-flat major 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 Piano Sonata No. 16 in C major by Wolfgang Amadeus Mozart, Alla Turca by Anton Diabelli, Alegretto by Franz Schubert — see the full similar-pieces list on this page.