Hot Moon by Alan Smale is free for the next couple of days.
Amazon UK:
https://www.amazon.co.uk/dp/B09ZLR35FV
Amazon USA:
https://www.amazon.com/dp/B09ZLR35FV
It doesn't appear to be available at Kobo.
This is an alternate history of the Space Race. The USSR get to the moon first, so the space race continues into the late 1970s....
I bought this a while back and read it a few days ago. It reminded me a bit of The Martian, in that our hero survives impossible odds, but in a way that is just plausible. I enjoyed it.