You are thinking of Darkseed. I remember the game as well. Very "Sierra" like point and click game that I too remember not being very good (as compared to all of the stuff Sierra put out) but I agree with you, the artwork in the game made by Giger actually kept me playing the game that I would have normally ditched.There was a video game back in the early 90s, can't remember the name of it, that was illustrated by this guy. I downloaded it from some BBS. Overall, the gameplay sucked (it was a kind of adventure/role play game) but the graphics, in particular the artwork, were stunning for the time (probably even for today). Unfortunately this meant having to swap a 3 1/4 inch disk for every screen change... but still made enough of an impression that I remember it today in my old age.