This version represents a specific solo piano arrangement of Mourey's hypertonal concert concept. It is musically notable for its unconventional treatment of tonal centers within a brilliant keyboard style.
Pay close attention to clear voicing in the complex middle register to avoid a muddy sound.
Comparable difficulty and character — good candidates for what to learn next.
Allegro de Concert Hypertonal pour piano solo is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 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 Allegro de Concert Hypertonal pour piano solo lasts about 6 minutes.
Allegro de Concert Hypertonal pour piano solo 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 Allegro de Concert Hypertonal by Colette Mourey, Rhapsody in Blue (Solo Piano) by George Gershwin, Fantaisie-Impromptu in C-sharp minor by Frédéric Chopin — see the full similar-pieces list on this page.