Grigor Arakelian's 'Bells' utilizes modern harmonic textures to evoke the resonance and overtones of metallic sounds. It is an exploration of piano sonority and sustained resonance.
The primary challenge is managing complex pedal overlapping to create the desired bell-like acoustic effect.
Comparable difficulty and character — good candidates for what to learn next.
Bells is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Bells lasts about 4 minutes.
Bells 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 Clair de lune by Claude Debussy, Gymnopédie No. 1 by Erik Satie, Prelude in D-flat major, No. 15 by Frédéric Chopin — see the full similar-pieces list on this page.