Among many themes I like apocalypse themed things. When I announced my first game 90% of the people said it’s surely fallout 4 inspired. When it was out and obviously wasn’t, people assumed other games I haven’t played before, but turned out there really were similarities.
I think it’s fine to get inspired by something, as long as its content is different from the inspirational source. You’ll bump into speculations every now and then. There are so many creations and known, liked “cliches” out there it’s nearly impossible to not have a moment or two where it’s similar to XY game,movie, or book. Write what you want, be unique, let people test it, they’ll give you feedback. @Lycoris defined it pretty well.
That’s just my opinion, I can be wrong though.