Steam player here.
I have really enjoyed both demos, and im looking forward to the full release!
In general i like where you are going with the game between the previous demo and the most recent demo. But I thought id give my 2 cents on the changes.
I like your decision to add the more in depth h-scene after treatment is done. It feels more involved and a larger payoff compared to the later game interactions in the old demo. However, i feel like something was lost now that the mid-treatment interactions are gone. It was to the point that I honestly enjoyed the next fest demo more, because the treatment was more engaging. Now it just feels like im doing nothing while the potion ticks down.
Here is my thought on what could be done.
Add upgrades for stripping and/or massaging as interactions to be done mid treatment. These actions could affect the treatment thresholds for status effects. For example, stripping could help "find the wound" reducing the hp % required to cure it. Massage may relax the patient, making a potion perform the same total amount of healing, but in a shorter time.
The general idea is that the mini-game/quick time event can be used to lower requirements for treatments, or provide temporary buffs to the applied potions. This way they can be useful and engaging (both visually and in gameplay) while not being required to perform treatments.
Just my thoughs on how to handle it, by pulling ideas from older versions. You are welcome to handle making treatment more interactive in other ways. I just liked how the previous system felt like I had to diagnose the injury before solving it.
I am looking forward to see what you do with the official release!