Tenth Plague is a competently handled short game- each scenario (other than the final one) is slightly more trickier than the last. There's also a hidden commentary mode, which is a neat feature.
There are only a few problems in the implementation of incidental items that Lynnea probably didn't expect anyone to bother interacting with, and I struggled with finding the wording for at least one of the puzzles, though it was always clear what I needed to do to proceed.
I really liked the small visual elements like the dead locusts on the roof, that hinted at the plagues that had come before. The puzzles were simple enough that the game moved along at a fast pace, which worked well for evoking the swift inevitibility of the plague. One of the strengths of IF, seen clearly here, is that novel game and story premises can be explored.
(As far as ratings go- I take 3 as being 'good', '4' as 'great', and five 'transcendental'. In truth, it deserves at least a 3.5).