It is a good thing that Robert E. Howard is not around to see what happened to his barbarian, Conan. Though his original stories are by no means great literature, neither are they the violent, mindless trash that later generations have associated with Conan the Barbarian.
Conan Kill Everything takes that later tradition to its logical extreme. Conan has found the evil wizard, and in order to exact his revenge, he kills everything. Absolutely everything.
In order to kill everything, Conan must solve a couple of very standard puzzles. There are some humorous elements, including the speeches of the wizard and the final move which you need to make to win the game; but in the end, the game is totally forgettable. The jokes are not brilliant; the puzzles are not themselves interesting; and it parodies something that is already so far beyond the limits of good taste and serious intention that it does not allow for parody.
Since you can play the entire game in 15 minutes, you still might want to give it a try.