I understand points are assigned based on distance covered. What else do you get points for? Is there a list somewhere?
2 of the + sign power ups give points. 10 and 30 points.
Not sure what else aside from every 1mi or 1km
I skipped half of level 9 when I hit 1300 watts. (I didn’t really generate that many watts but after communication was lost and restored with my Kickr, I got a blip that hit 1300). So there are certain “awards” that give you points. I remember getting such an award when I drafted for 15 seconds on one of my first rides.
The big plus sign gives a lot more than 30 points 
The big + sign has given me +250 both times I hit it.