Oh wow. Great concept. It sounds like something you could base a very compelling novel on, and yet also, a game is possibly even more appropriate for it.
I for one am more interested in seeing what you do with the similarities rather than the differences between the two brothers.
Cheers, yeah my plan was to start off by showing how different they are but over the course of game break that down and show how fundamentally similar they were all along. Not particularly original but I think it's really good way of getting into the heads of the characters.
I've been doing some preliminary research and I'm thinking I'm going to base it around the Apollo 12 mission. Since that was a time when the excitement over the moon landing had already happened and the beginning of the public losing interest in space exploration. Also as this was late 1969 the hippie movement had already passed its peak and losing steam. So gives the two characters good crisis points.
Since I don't really want to have my two main characters to be real, I think what I'm going to do is have it be slightly tangent to reality with one of the real Apollo 12 astronauts being replaced by a fictional character shortly before the mission. Means I can make reference to lots of real things and people but go wild with my main characters.
In terms of the game, right now I'm thinking I'd actually like it be a mix of adventure and mini-games. Like for each character there is a hub area (flat and space ship) where they can talk to characters and do adventury things but the events in their lives are played out as little game sequences.
Not starting developing on this yet, as I've got an Action 52 game to finish (hopefully asap) but I'm getting some research material as I kind of want this to be fairly historically accurate if possible, want it to reflect that place and time as much as possible.