This piece by Joseph Kromolicki reflects the late 19th-century tradition of accessible, lyrical keyboard writing. It relies on conventional harmonic progressions and a balanced, song-like structure.
Pay close attention to balancing the melody against the harmonic accompaniment in the middle register.
Comparable difficulty and character — good candidates for what to learn next.
Alleluja (Op. 16) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Alleluja (Op. 16) lasts about 3 minutes.
Alleluja (Op. 16) 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 Bénédiction by Louis James Alfred Lefébure-Wély, Amarante by Edouard Silas, Berceuse by Théodore Dubois — see the full similar-pieces list on this page.