Bonus Scene with Combined Rooms
Added the sounds of the ball bounce and blocks with a audioSource.PlayOneShot in OnCollisionEnter in a new CollideSoundPlayer script. It sounds a bit off though.
Added the UI for counting remaining collectibles from the 2D scene, and modified UpdateCollectibleCount script to trigger the confetti particle system placed on the Player. It finds the particle system by first finding the Player with Gameobject.Find then the child confetti object, and then the particle system component from it, I suppose I could've passed in particle system directly into the script but it seemed more in line with the rest of the script to use find.