You are right! The aliens stay in the pods making it more difficult each round. If they left the pods, then eventually you would have 30 pods on screen and only 3 aliens hiding. Maybe that would be too easy? I'm not sure. Or more aliens could run on screen each round, but maybe then that would be hard to track them.
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Depends. If there's 30 on screen, just remembering which ones have aliens might be a challenge in itself. Maybe I should try it a few more times and see if I can master it, though if I recall correctly, the average person can only remember 7 things at once. Do want to say I enjoyed getting to relax with a nice puzzle game after playing so many fast paced ones.