This is a character piece in the style of a polonaise by the German composer Johann Gottfried Krebs. It is distinctive for its adherence to late Baroque keyboard idioms while anticipating the lighter galant style.
The main challenge is maintaining clean articulation in the ornamental flourishes while keeping a steady pulse.
Comparable difficulty and character — good candidates for what to learn next.
Alla Polacca in B-flat major is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 3.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 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 in B-flat major lasts about 2 minutes.
Alla Polacca 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, Bouree by George Frideric Handel, Blumenwalzer by Léon Jessel — see the full similar-pieces list on this page.