Charles Balmer's set of variations is a nineteenth-century character work based on a folk-like theme. It utilizes standard variation techniques to elaborate on the melodic contours of the theme.
Maintain a unified character across varying textures in each variation.
Comparable difficulty and character — good candidates for what to learn next.
Blanche Alpen with Variations is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 Blanche Alpen with Variations lasts about 5 minutes.
Blanche Alpen with Variations 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 Berlin Gallop by Charles Balmer, Cahokia Polka by Charles Balmer, Bluebells of Scotland by Jules Egghard — see the full similar-pieces list on this page.