That's it! We just made a game in 20 minutes or so, which shows you just how fast SpriteKit is. I even showed you how per-pixel collision detection works (it's so easy!), how to advance particle systems so they start life with some history behind them, and how to adjust linear and angular damping so that objects don't slow down over time.
If you're tempted to work on this project some more, you could start by fixing a bug: if the player gets in a difficult position, they can just remove their finger from the screen then touch somewhere else to have the spaceship immediately jump there. How could you fix this? Well, one easy way is to add code for
touchesEnded() that terminates the game if the player stops touching the screen.
If you're looking for something bigger to try, how about turning this game into a full space shooter. To do this, you need to create lasers going the opposite way, then make those lasers also collide with the space debris. In terms of controls, it wouldn't be hard to use
touchesMoved() to move the player and
touchesBegan() to fire lasers.
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Paul Hudson is the creator of Hacking with Swift, the most comprehensive series of Swift books in the world. He's also the editor of Swift Developer News, the maintainer of the Swift Knowledge Base, and Mario Kart world champion. OK, so that last part isn't true. If you're curious you can learn more here.
Hacking with watchOS
Transfer your Swift skills to watchOS the easy way, and learn to build real-world apps in the process!