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It would make more sense for Abe to sneak behind barrels, pillars, walls etc, but steam is probably easier to see for the players.
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The gameplay happens on a 2D plane. If Abe goes "behind" the barrel from the player's perspective the slig can still see him.
Changing shadows for steam vents made sense transitioning the system into a 3D world, but I do agree that there might be a better way.