Op. 127 is an expansive march that highlights the virtuosic writing typical of late 19th-century salon music. It is distinguished by its orchestral textures adapted for the keyboard, utilizing heavy chordal writing.
Players must achieve a powerful, resonant sonority while managing wide-spanning chords.
Comparable difficulty and character — good candidates for what to learn next.
Canon en form de Marche (Op.127) 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 Canon en form de Marche (Op.127) lasts about 4 minutes.
Canon en form de Marche (Op.127) 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 Passacaglia by George Frideric Handel, Ballade by Samuel Coleridge-Taylor, 'The King of the Jews' - Incidental Music by Alexander Glazunov — see the full similar-pieces list on this page.