Thank you for playing man :). The civilians were only to regain health. You actually don't really need to save them otherwise other than to increase your combo. And yeah, a lot of people feel the game is a little too hard XD. I'm going to be releasing a post-jam version for pc and mobile after the jam though. It's going to be comparitively more easier and balanced. Thank you for playing and for your feedback :)
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Ah, didn't realise they were just for health, in that case the spawn rate for them is probably good. That does remind me of some other feedback I forgot to add, the tutorial page you made was a bit too visually busy, I'd maybe seperate it onto multiple pages so it's not a visual overload :) It's a really fun game though, and I enjoyed playing, good job!