Welcome aboard!
You're playing a demo, so yeah less than 25% of the content is enabled.
But it is a solo hobbyist project being worked on at most 1 day a week, and with all art crowdfunded, so don't expect fast developments.
Essentially there's no point raising any visible stat but Trust beyond 25%, which will start raising Ruby's invisible horniness stat as she chooses sexier rewards.
Doing some gentle punishments will also start unlocking masochism stuff too but that's not visibly tracked. But the only content fully written is the rewards, which vary based on trust and the invisible horniness and masochism stats.
There's 29 reward scenes to see total, once they get art I'll institute a gallery of some kind.
That and the aftercare, that's sorted.
Ruby's stat progress is locked by the scenes in the bedroom, so it might be that it's not that the action's aren't changing the stat right but it's that stat growth needs unlocking by having her visit on the correct night.
Or it could be a bug, I'm definitively not perfect and I'm testing almost exclusively on my own.
Please send screencaps etc!

Same for SPG mistakes, I'm reliant on you folks to catch the stuff I miss. It's why I reward bugs found etc. with butts.