This final entry in the requested group displays sophisticated motivic development typical of the high Baroque. It is notable for its rhythmic drive and clever imitation between voices.
At Henle 5 this is a late-intermediate piece — technically substantial, with musical demands to match. The main demands: independent voices that must each sing on their own line; ornaments that need to sound effortless, not squeezed in; and fine finger independence within the hand.
Beyond that, expect precise articulation — the difference between crisp and blurred is the piece.
The main challenge is maintaining consistent tempo through the rapid ornamental passages.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Lesser-known works by the same hand, at a comparable level.
Fantaisie, OL 69 is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 8.
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 Fantaisie, OL 69 lasts about 3 minutes.
Fantaisie, OL 69 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 Fantaisie, OL 68 by Louis Couperin, Fantaisie, OL 48 by Louis Couperin, Fantaisie, Ol 49 by Louis Couperin — see the full similar-pieces list on this page.