I think the game has been (mostly) finished storywise since v1.13-14 at least, but the follow-up editions have brought changes:
- Corrections to how some elements (erogenous zones, facial expressions of mob characters and so on) fit in with each other were done.
- Some dialogue/reactions received expansions &/or tweaks: now both virgin and "nasty" mob characters respond differently to the MC's harassment than the rest), two "after the end" scenes involving further punishment of Olivea, a dialogue about Chrisia as the MC's assistant/secretary that might be a hook for further shenanigans with her.
So, no idea about what the "test files" might be, but additional content in the future seems quite probable based on the current pattern.