The rat world and narrative voice of the descriptions was a lot of fun. The game was pretty short, though, and it had a lot of space that didn't really have any significance to the plot; it definitely left me wanting more.
I thought the combat mechanic was interesting and fun; it'd work well in a larger game with more variety of weapons and opponents, which would have room for using it as part of larger puzzles or other second-level usage.
I also though the ending was pretty cute.