In it's current state, this is a really good oneshot. If it were to become a full manga then It'd need several changes such as a different plot that'll last longer, something like the space agency finding out about the Io and attempting to track her down after she got back to earth in the MC's body.
Oh, and just as everyone else is saying in the comments, It's sad to say but I think what Nikolai did might actually happen IRL, so many people are ready to attack what's different to them.