Hässler was a prolific composer of pedagogical keyboard music during the late 18th century. This Allegro displays the modest technical demands typical of student repertoire from that time.
Students must focus on keeping the pulse steady throughout the sixteenth-note passages.
Comparable difficulty and character — good candidates for what to learn next.
Allegro 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 Allegro lasts about 1 minute.
Allegro 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 Blumenwalzer by Léon Jessel, Bluin' the Blues by Henry Ragas, Bohemia by Joseph Francis Lamb — see the full similar-pieces list on this page.