Hey, you may have already found this out by now, but the setting to make things always face the camera in most of the 3D nodes is called 'Billboarding' (it's usually under a 'Flags' dropdown). I found out during our project this jam that you can also do it with GPU 3d particle effects if you attach a Standard or ORM material to them (I suppose if you have a custom shader you might have to do it manually?)