As the title says I want to rotate my player based on the angle of the platform its standing on. I'm using the Platformer Template.
You might want to add the physics behavior to the player. I think that will work, but you may have to mess with it for a little while in order to get the desired effect.
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Set player angle to platform.angle if player is overlapping platform. An event like this would do the trick without any new behaviors. If you want to get fancy you could try something that rotates the player over time as they approach the platform. Hope that helps.