Well if it was meant to be a summer job, as is implied at the beginning of the game, I can see how it might limit the options. Play once, learn the game and events, then replay for a different set, knowing how to set a strategy. Though considering how quickly walkthroughs/cheat options get out that's not such a realistic model.
Rereading the Legend of Krystal thread Vren did hint that there would be more major scenes, so that missing some of the ones available now would not be too bad, as there would be other opportunities. This is his quote: "it presents enough easy to reach content that you will stumble into it and end up with a full game experience just by spending time exploring"
Which is not too bad, if that ends up being the case. Problem with games like this early on is you don't get that full experience yet, because of the missing content. I do like the slutty levels, its a passion of mine, so as long as those are there with major scenes I am fine with it. Granted that's not everyone.