One of the earliest "cinematic platformers" and a damn good one at that. While I don't think it has as much personality or polish as Oddworld, All of your jumps feel weighty and the level design makes good use of those mechanics. The aesthetic for this game is also great, with each area being atmospheric and interesting to look at. Oh, and this game has an incredible amount of crazy death animations. Those alone should make this game worth playing.

The control scheme is clunky and outdated, as are the cutscenes, but Heart of Darkness is an undeniably beautiful and macabre game. (This is a prime candidate for a remake/remaster.)