Hey, congrats on the compositions. You picked my favorite theme from the Thalberg, and you play it very well. The style is definitely different from Thalberg -- sort of "Donizetti meets Rachmaninoff, with Thalberg's arpeggios" -- so it doesn't sound imitative. I, too, love operatic transcriptions (and opera itself including Donizetti).
Have you heard John Bayless' recordings based on Puccini operas? Those are quite enjoyable too.
The Thalberg Don Pasquale fantasy is one of my favorite pieces (I have an old recording by Earl Wild), and I had just downloaded the sheet music thinking of learning it. I've enjoyed playing some Liszt operatic paraphrases, but have never played anything by Thalberg before, though Liszt uses similar "three hand" effects in his Norma Fantasy.
I think there was a time when these "operatic paraphrases" were not considered seriously, but that seems to have changed with the advent of Lewenthal, Hamelin and others (including you!), and I'm glad, because they can't be beat for beautiful melodies and pianistic effects, even if they don't have the groundbreaking originality of "pure" (nonprogrammatic) music.