Johann Adam Reincken was a major North German Baroque organist and composer. This ballet is a somber and expressive piece that displays the characteristic depth of Northern European Baroque keyboard writing.
Focus on a deep, resonant tone and proper phrasing within the contrapuntal lines.
Comparable difficulty and character — good candidates for what to learn next.
Ballet in E minor is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
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 Ballet in E minor lasts about 3 minutes.
Ballet in E minor 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 Gymnopédie No. 1 by Erik Satie, Gymnopédie No. 2 by Erik Satie, Gymnopédie No. 3 by Erik Satie — see the full similar-pieces list on this page.