Well one of my pet projects for the site was to come up with an Influenced By / Influenced page. This would list things that the Sogna/Silence games drew inspriation or design components from, such as Ranma 1/2, Dirty Pair Flash, Variable Geo, Super Zugan (a 1992 tv show), waitress restaurants, and Little Shop of Horrors. Or list things that apparently draw inspiration from the Sogna games, such as the Love Fetish games, the Green/Love Escalator series, Lakers 3 (brief animation), and Chuushaki 2 (the three nurses are a tough redhead, timid blonde with braids and glasses, and a more mature one with dark hair.)
Chasing some of these links in the chain may reveal some more insight such as common artists or writers between the two.