First, I should state that I'm not a fan of Lass in general.  Legion and Tsurugi Maya are decent writers... but as scenario-designers go, they tend to screw up the pacing at the beginning and toward the end of their VNs to one degree or another.  Also, they have a long-standing preference for the 'only difference is the epilogue' style of 'heroine route', which leaves people like me who enjoy immense variations in story based on which heroine is chosen feeling unsatisfied.

In that sense, Liber 7 is no exception.  This VN is structured so that only small amounts of content are actually changed based on which heroine you choose (with the exception of Miku, who has a really extensive true ending). 

Technically, it would be proper to call Liber 7 a chuunige in the 'old style', where the protagonist's side is full of characters just 'caught up' in the conflict of the story.  In this case, as in most chuunige of this type, the characters adapt to their new abilities quickly and the protagonist goes from being a 'normal guy' to a central mover even faster.  In my experience, this is the weakest type of chuunige, as the idea of a 'normal guy' adapting so easily to supernatural battles and the like is pretty ridiculous.

I'll be straight about this game... for all that it does have a lot of moments where it shines (especially when it tries to evoke your emotions), this VN also has an excessive amount of tedium.  The 'time loop' trope is one of the most over-used ones in fantasy and sci-fi stories, but most of the time, the writers have the sense to avoid rehashing the same events more than twice.  Unfortunately, the writers in this game chose to rehash the events of the first morning completely in every single loop, which made me bored on top of the headache I got from my stomach virus.

That said, this VN has some nice combat scenes (nothing on the level of Light's or Akatsuki Works games, but decent), and I particularly loved the scenes dealing with Clair, Saya's, and, finally, Miku's issues.  The emotional impact from those characters' personal difficulties is intense and worth a tear or two. 

Honestly, I can say that this VN is a mixed bag.  It has some really solid scenes and parts to it, but the pacing is sometimes awkward.  Not to mention that the way that Lass deals with heroine routes is more than a little unsatisfying by even charage standards.  This isn't a VN of the Month level game, but if you are just looking for a mystery science-fantasy VN to pass the time, it isn't a horrible choice.