Unlike previous titles that focused almost exclusively on character creation, Room Girl functions more like an "eroge" version of The Sims .

This version features updated "Studio" plugins, which allow players to create custom dioramas and animations outside the main life-simulation mode.

Room Girl introduced reworked hair shading and subsurface scattering (a technique that makes skin look more realistic by simulating how light passes through it).

The (October 2022) was a major milestone for the modding community, stabilizing the game shortly after its launch.

The game uses a complex "Favorability" system. Relationships evolve through stages like "Curious," "Interested," and "I can only see you," which are unlocked by specific conversations and activities.