Is somebody here?
Ok, I think I solved it myself. But it would be nice to know if my solution is really right the way to go.
Object structure:
+Kinematic2D
+....Sprite
+....CollisionShape2D
+....Area2D
+........CollisionShape2D
Then I used the Kindematic2D layers and mask for colliding to floor and walls and the Area2D for enemy contact.
It took me a while to realize that Godot is not limited to ONE collision shape and type as other engines are. So I assume this solution is the intended way to handle this. Correct?