Sergio Aarón Pérez writes in a contemporary idiom that utilizes rich harmonies and careful voicing. This piece provides a more modern take on the 'sweet' (dulce) character piece genre.
At Henle 3 this is a late-beginner piece — comfortable hands-together playing is assumed, and musical shaping starts to matter. The main demands: fine finger independence within the hand; chord voicing — bringing out one note inside a handful of others; and a true singing tone, with the melody floating above the accompaniment.
The piece demands careful finger independence to separate the melody from the interior accompanying voices.
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.
Dulce is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Dulce lasts about 4 minutes.
Dulce 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 Eloquent walk by Sergio Aarón Pérez, Gymnopédie No. 1 by Erik Satie, Gnossienne No. 1 by Erik Satie — see the full similar-pieces list on this page.