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The game is starting to really shape up now. In fact, it's practically finished; the only thing left to do is implement some kind of scoring system and a method that causes the game to end. Let's tackle the scoring first, I'll show you how to end the game in a moment.
As the gameplay is entirely different to the last game, you need to come up with a different metric to base the scoring on. Seeing as you're trying to survive for as long as possible, then surely the amount of time that you've survived for is a good metric. Right? Good, I';m glad that you agree with me on that.