Auguste Dupont was a celebrated pianist-composer whose concert works mirror the salon style of the mid-19th century. This piece is characterized by its florid, romantic melodic lines layered over active, flowing accompaniment.
The student must balance the delicate, singing top melody against the dense, decorative harmonic figures in the left hand.
Comparable difficulty and character — good candidates for what to learn next.
Allegro du concerto No.1 (Op.11) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 du concerto No.1 (Op.11) lasts about 8 minutes.
Allegro du concerto No.1 (Op.11) 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 Ballade No.2 by Auguste Dupont, Bravura-Valse by Archy Rosenthal, Allegro de Concert pour piano by Vincent Adler — see the full similar-pieces list on this page.