I like the idea of this game, and I am looking forward to seeing how it grows and develops. I do have some recommendations to put forth though.
1. Please add in a settings option so sound levels can be changed. An option for choosing imperial/metric system would also be appreciated as currently the only option seems to be the metric system, and it is inconvenient for players used to the imperial system to have to calculate or estimate to figure out the actual measurements of the characters.
2. Fix the bug where HP and scale gained through vitality is lost each time you sleep and then regained after a drain, as this is both extremely disruptive to actual combat during quests and the growth-based focus of the game to have it randomly clear your attribute-allocation gains every single time and only give them back when the demoness levels up.
3. An option to choose how much to allow the demoness to drain you would be nice. Currently she can only drain one level at a time when you get the RNG event, and currently the gameplay loop if you actually want to see some growth happen at a reasonable pace seems to be more about menuing as effectively as possible to defeat one or two enemies before going back, choosing another quest, then sleeping and hoping to get the drain event again.
4. A sort of warning to how enemy scaling works would be very useful, as it is very easy early in the game to clear through massive quantities of enemies in one quest and then have the demoness extremely under leveled as a result since she only levels up through a common cutscene tied to sleeping after a quest and currently only gains 1 level at a time whereas the number of levels the player character gains is limited only by how many foes they can defeat.
5. An option for a male or female player character would be nice and be a bit more inclusive for more people.
There are of course more things I would love to see in the game and I have visited the Patreon page and seen what you've posted there, so these recommendations are based off of what I did not see, what I have already seen others recommend, and where I believe this game is at in terms of development. I appreciate what you have done in creating this and I hope to see this project become truly amazing in time!