This is a contemporary contrapuntal work written in the form of a strict canon. It is distinctive for its systematic use of the ascending sixth interval within the polyphonic structure.
The primary challenge is maintaining clarity and evenness in the voice leading between the four independent melodic lines.
Comparable difficulty and character — good candidates for what to learn next.
Canon 4-voice ascending 6th in B minor is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
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 Canon 4-voice ascending 6th in B minor lasts about 2 minutes.
Canon 4-voice ascending 6th in B 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 Binary Star by Jun Yamamoto, Canon 3-voice in A major by Jun Yamamoto, 'Werde munter, mein Gemüte' by Johann Sebastian Bach — see the full similar-pieces list on this page.