If you're like me, when checking out a new game system, I'm asking the question, "What's different? Why should I care?"
In Plot Point Core, improvised statements made by players become facts.
That's the key difference between this system and others. By default, when a player makes a statement about the game world, it's true.
The GM can modify or veto these statements when they conflict with the setting, stretch credulity to breaking, or otherwise impinge on the continuity of the game narrative.
Likewise, when an improvised action carries a weight of possible failure that has meaningful narrative impact, the statement may not become fact.
Otherwise, if a player makes something up, it's true.
This game leans hard towards the narrativist end of the spectrum.