First off: I am severely disappointed that Indiana Jones and the Last Crusade: The Graphic Adventure doesn't even get a mention, this is a great game and important on the development of graphical adventures. This great playable intro alone is something else.
https://www.youtube.com/watch?v=9ivNLD75rAU
But this year again has multiple important games. I don't know if Populous is the first in the god game genre, but it certainly popularized it. SimCity may be well the first simulation sandbox game. Prince of Persia showed new animation techniques. This is very hard. I like Indiana Jones, but I also consider SimCity or Populous. Ah. let's go with Indiana Jones, alone because you forgot it! So I choose other :)