You know. If you are on the Quadrouple path, the end of chapter 4 is one of, if not the best, example of what a lot of us want out of a x-ouple or "harem" story. Regardless of the rest of the story, premise, etc. that part makes this game worth the play. Although, that being said, the rest of the game I quite liked.
I think any dev who wants to add a poly/harem path or focus to their game should play this one for a really good example on how to make it flow well and not just be a series of pokemon encounters.
-edit
Well, I think this page was cached when I wrote this as the whole discussion about Heidi that seemed to start with Bloodguard wasn't on here. Just want to add my two cents that I thoroughly enjoyed Heidi and feel that to make a poly relationship work, there needs to be someone like her in it. All of this is fantasy, of course, but the more effort an author puts into grounding that fantasy in some semblance of realism the better the story works. The support each of the girls gives to each other and the fact that they are bi also is a necessary component as well, I think.
That is the difference between a poly xouple and a harem. Generally a harem doesn't require interaction or even acceptance from the girls and is based on power and not necessarily on romance/love. The "bottom bitch"/ "cuckquean" type role needs to be there so if you don't like how Heidi fills that role, that is a valid critique, but I think that role needs to be filled by someone.
-edit 2
By the way, I prefer Athena as she is in later scenes in the Quintouple path without her makeup. She is very cute without it. And IMNSHO, she would look even better without the magnet magnets as well.