A lot of times, in overworld area, some elements as flower, some times have collisions and others not, the water in a level (I don't remember the number) I think that was grass, In the level 5, with some blocks I bealived that has collision, etc
Oh yeah on the overworld I’m still figuring out which things should have collisions and what their collision me should act like. The flowers are a really good example of that
