Yup, this is correct. Act 1 is very light-hearted and slice-of-life, and rather than having a large amount of pivotal story moments, it's more an introduction to all the major characters, and encompasses the first big phase in the MC's 'corruption'.
Now that all the pieces are set in place, Act 2 will have a larger focus on story (including some dramatic moments), as well as more hardcore sex scenes, and potentially even romance, depending on the player's choices.
I may consider adding a 'skip to Act 2' option to the intro at some point, with a short five-or-so-minute summary of everything that's occurred thus far. This way, new players who aren't into slice-of-life can skip to content that's more palatable for them. Of course, this is not the recommended option as it skips hours of build-up and characterization, but I think it's important for a developer to be inclusive of as many types of players as possible.