I had a similar thing happen to me…
I had started writing my WIP, put up a little play-through and was a shocked when I had comments telling me how the things in the story were oh so similar to this game called Fallout. I had never heard of this game before, so I ended up going to wiki and BOOM! My story had similarities that we’re being echoed. Story set post nuclear, civilisation trying to recover, aftermath of radioactive things… using jumpsuits. I felt like people would think it was some sort of fan-made fiction. I decided to not worry too much about it for these reasons: 1) I had never played it. I still refuse to play any of their titles until I’m done writing my story… which is quite slow but I’ll get there. 2) Someone will point it out if they think you’re copying. People were saying that it reminded them of Fallout… not that I had copied from them. (I ended up deciding to explain that in the first post so that I would not need to keep re-telling how I had never heard of Fallout until I had uploaded the story. 3) I checked up on the laws concerning copy right within my country. I haven’t played the games, and I can prove my planing and so on and so forth. 4) I had already spent a lot of time planning the story lines. I wasn’t ready to give up and have that time wasted.
It can be hard not to tread on the same tropes/cliches/themes as other similar stories but unless your story is an identical/near identical story of those, than I doubt that it’ll be on the lawsuit level. Honestly, I was a little scared to keep writing my WIP for the same reason. Especially when I found out the Fallout series was getting another installment; Fallout 4. I was worried it was going to be too similar.
Don’t stress, people enjoy similar stories.
Also, pick a temporary title. Not a finalised one, you may think of one that fits your story better when the whole thing is finished. In my case, I ended up changing my WIP title as a movie came out with the same title… and I wanted the story to not be associated with it. I find it frustrating when I go to search for something but all these other things with the same name come up instead… but it’s up to you. Your story, that’s just my advice.