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Developer: NephremKa
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You made a nice game so don't be afraid to advertise.  Probably could have made some money if you paid polled some sex scenes along with waifu polls (people will pay to defend a good waifu)   ;P Though that might have kept this going for much longer since fans always want more of a good game...

I'm pretty sure Renpy has Gallery Settings built in but you need to compartmentalize the scenes in labels and write up the display.
Example:
if renpy.seen_label("familyyes"):
imagebutton auto "images/thumbnails/familyyes_%s.png" action Replay("familyyes")

%s
hover, idle

else:
If it wasn't seen yet then a locked image.  Though instead of auto you probably would just want idle.

That reads Data off a persistent save.  If you wanted to offer a Full Gallery Cheat then a bit of code to populate the Persistent Dictionary
$ renpy.game.persistent._seen_ever["familyyes"] = True

Might need to throw a few more variables in persistent for replay purposes or use something like
if _in_replay:
To define some variables needed for the scene.  Though variable management might make this unnecessary.

https://lemmasoft.renai.us/forums/viewtopic.php?t=46976

I doubt a heart-attack, for Renpy it seems fine, sure some optimization could be done (ie use more labels for scenes) but I wouldn't sweat the small stuff.  You never learn unless you try.

Yeah I probably did miss the Principle's storyline, along with several others.  Went for Rubi and was happy with her ending though would have liked to went out with a bang inside and possibly an ominous warning about having more children.  Wanda didn't seem to have the happy housewife ending as I told Rubi no just to see what would happen.  But as I said earlier added Replay-ability.