That's right for adding the score but the 'every tick -> set text' should be it's own event and not part of the 'on start of layout' event.
For the speed change the impulse value. In the example the impulse is set to
distance(Self.X, Self.Y, CatapultBlock.X, CatapultBlock.Y) / 4.5
Just change that 4.5 value.