Nice job man. The fact that you took the criticism given to you and made the changes needed is huge. One of the biggest qualities needed for game development is being able to work with others, and using the feedback given to improve your projects. If you ever decide to come back to this project, I can help you on adding a point system.
also for the lives, if you set the hasStarted bool back to false when it makes contact with the lose collider while you still have lives left, the ball will stick back to the paddle and the player can hit space again to continue playing. the way it is right now makes it hard to prepare since the ball starts back up right away. Other than that, great job man!