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With interactive broadcasting – or Broadcast+ as Housemarque has dubbed it for Dead Nation: Apocalypse Edition – a developer can create ways in which your viewing audience can alter the course of the game while you’re playing it.

In the example of the PS4 version of Dead Nation, there will be situations where users can vote either to make the game easier or harder – the examples given being the opportunity for additional ammo and enhanced speed or extra zombie spawns and limited use of the sprint ability.
Interactive broadcasts have actually been functional since launch, but very few games have used the option.

In fact Tomb Raider: Definitive Edition actually comes with the feature, which very few people seem to have picked up on.

During a livestream viewers will have the opportunity to either let Lara be revived or to die when the player suffers fatal damage; which is admittedly a little redundant – the internet is a cruel place, so don’t expect to be revived any time.
PS4’s Forgotten Feature That Sony Needs To Shout About - NowGamer