Just like you said, there is a problem with the camera. IMO, it is moving too fast and too close to the scene until the fall of the 2nd ball (first 10 seconds), so we cannot really see the animation of objects. During the last 10 seconds, camera shows a more “global” view of the scene, that gives a better feeling, and allows us to really see the animation of dominoes falling.
The first ball is maybe rolling too fast, and stops too suddenly.
Because of the camera position, we can’t really see the movement and fall of the second ball, which would be one of the most interesting animation for a beginner.
This is not bad at all for a first animation