Thanks for your comments Hexaae. The player inertia is not as brutal as the arcade, this is to allow the casual player to see a chunk of the game without too much frustration! I do appreciate others want the original player movement so will look into the possibility.
There could at least be an update which will see the arcade style scrolling replicated far more authentically. Hopefully get round to implementing this soon.
You should be invincible right until the fairy leaves the screen, not sure what is happening there. Will test and add to the list if needed.