My take
Very cute.  Can't wait to read the rest of the series.  Very easy read.  Read it in one evening.   The end of the Earth and the mice are mad.  The Vogons ruined everything by blowing Earth up.  Oddly enough, the whole towel thing is never really answered, or addressed other than in the beginning (unless I missed something).

Synopsis

Don't leave Earth without this hilarious international bestseller about the end of the world and the happy-go-lucky days that follow...about the worst Thursday that ever happened and why the Universe is a lot safer if you bring a towel.