Add a new behavior called "First Person Controller" to enable a 3D first-person view and simple movement controls.
Not for the moment. You can reduce the size of the sprite that you place the Behavior on. This will give you more space to move around without colliding with the objects.
I’ll take note of this issue and look into the possibility of improving the behavior’s collision so that the player can slide when colliding with an object in a future version of the Behavior.