This is a brief, avant-garde character piece intended specifically for the unique timbre of a toy piano. It explores the percussive and miniature qualities of the instrument through a modern lens.
The primary challenge is managing the limited key range and the non-resonant, percussive action of the toy piano.
Comparable difficulty and character — good candidates for what to learn next.
12 Preludes for Toy Piano - Aves 鳥 is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 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 12 Preludes for Toy Piano - Aves 鳥 lasts about 1 minute.
12 Preludes for Toy Piano - Aves 鳥 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 12 Preludes for Toy Piano - Aves 鳥 vol.I by Kazue Rockzaemon Isida, 12 Preludes for Toy Piano or Celesta - Aves 鳥 vol.II by Kazue Rockzaemon Isida, 12 Preludes for Toy Piano - Aves 鳥 vol.III by Kazue Rockzaemon Isida — see the full similar-pieces list on this page.