Lyapunov's Op. 46 is a substantial work that expands upon the traditional barcarolle form with Russian harmonic coloring. Its depth and complexity differentiate it from the lighter salon pieces of the era.
Maintaining the distinct character of the layered themes requires careful attention to voicing and tonal weight.
Comparable difficulty and character — good candidates for what to learn next.
Barcarolle (Op.46) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 Barcarolle (Op.46) lasts about 6 minutes.
Barcarolle (Op.46) 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 Ballade by Sergei Lyapunov, Barcarolle by Sergey Lyapunov, Autumne Poem by Taras Yachshenko — see the full similar-pieces list on this page.