One very interesting element of the first Psygnosis barbarian game is that the screenshots on the box are depicting it as a VERY different game:
Note the complete absence of the point-and-click interface, lots of enemies on screen, as well as graphical elements not present in the final game, like doors and rock-dropping hoppers.
Same story in Obliterator - the box shows it as a pure action game.
I wonder if the boxes had to be done before the game was even close to complete.