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I agree with most of the comments about pace and such. I think another thing that would make it interesting is if there was some sort of bonus for keeping your planes on the correct path earlier, rather than at the last minute. So, incentive to move your planes to their proper paths early on.
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I lasted 30 seconds and then started intentionally running planes into each other. I applaud your effort, but it needs more if it's going to entertain me for any length of time. Keep working!