Hi! Well, my latest story (RedZone-137) was inspired by a youtube video about some guys trespassing into a SEGA arcade at the Fukushima's exclusion zone. Seeing the place completely abandoned, the silence in which in another time could have been a very noisy place, the fact that there was something dangerous but which you couldn't see, fascinated me to some point and made me question myself: "what if the world, as we know it, eventually ended?" "How would humanity survive in isolation, hidden in shelters?" "What if that outside world we take for granted actually becomes strange? Distant?"
Now with everything going on in the world, this whole plot scares me hahaha xD But I'm taking what's happening as a direct inspiration now. 
By the way, I read the first chapter of your comic. Seems like a very interesting premise!
And I don't think there's anything bad on taking inspiration from other stories, most plots have already been written. But the charm is in the way you write it, how you make that plot yours. 