This is a companion discussion topic for the original entry at https://www.kodeco.com/1163-how-to-make-a-game-like-space-invaders-with-spritekit-and-swift-part-2
This is a companion discussion topic for the original entry at https://www.kodeco.com/1163-how-to-make-a-game-like-space-invaders-with-spritekit-and-swift-part-2