Leybach was a master of the drawing-room style, and this transcription of Gounod's song highlights his ability to weave vocal melodies into thick, lush pianistic textures. It is characteristic of the late-Romantic salon genre where song-like melodies are surrounded by delicate filigree.
The technical difficulty lies in balancing the singing melody against the sweeping accompaniment without blurring the harmony.
Comparable difficulty and character — good candidates for what to learn next.
'Au printemps' de Gounod (Op.174) 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 'Au printemps' de Gounod (Op.174) lasts about 6 minutes.
'Au printemps' de Gounod (Op.174) 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 Caprice No.2 by Ignace Xavier Joseph Leybach, Alla stella confidente by Ignace Xavier Joseph Leybach, Boléro brillant No.1 by Ignace Xavier Joseph Leybach — see the full similar-pieces list on this page.