The onsen is not a rush through but if you try to do a quick-run-through you wont be able to see a lot of the contents in the onsen.
Why? because they are not compulsory and you just missed them.. you have to explore the scenes to try to trigger them.
There is a walkthrough in this site so you can refer to that. (man, at least read..)
plus the SM training(the horse chair) is also not compulsory. so maybe you just missed it completely.
Since the messages happen mostly in the first half in the game so if you use a savefile from 2.2.2a. Congratulation you just missed it again~
If you missed all the contents added, then you surely will feel like nothing is added. Dude, you just missed them, completely, though you could still blame it on us because we did not give you much "hints" to trigger those events. we will make the improvement soon.
We uploaded onto DLsite because we feel the content is solid AND our followers are angry becasue of the delay so this is the best we can go for. Usually, people complain because they are not seeing from the dev's perspective. While you complain we did nothing with the "4 sources of income", we spent a lot of time testing, configuring and improving the gameplay. The mini-games are not like at the beginning but we have made a lot of trials and errors and iterations before we come to that. Someone would say "man I can do that in a week", but if you really ask them to start from null, they can do nothing in most of the cases. And also a lot of the time was used in debugging and communicating with the team memebers(artist etc).
Lastly, there is no such a "4 sources of $$$", if I remeber correctly it is just Kickstarter where we get the fund to kick start our project and later Patreon joined in the way. There are no many subscriptions in patreon until the very recent months. but still, since we contract artists, the cost is high, unless you want something cheap.