An obscure modern work titled 'Blocks' by Joâo Schnier that focuses on structural simplicity. The piece utilizes basic harmonic blocks to build its narrative tension.
Pay close attention to finger weight to ensure a resonant, non-percussive tone in the blocks.
Comparable difficulty and character — good candidates for what to learn next.
Blocks is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 2.
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.
Blocks 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 Brévitude by Joâo Schnier, Blocks by Xbzoxmqp Uxsdajwo, Blocks by Yoshio Chino — see the full similar-pieces list on this page.