There's a game here on Itch called Space Chill that had a bit of the space tourism aspect to it. There was no travel in it, but you did have a spaceship interior you could walk around and see a really nice earth background. The screenshots don't really do justice to that part.
Don't worry about not having money, lots of developers -- including myself -- just make their games for the sheer enjoyment of it. So that leaves you with just the programming obstacle and even that can be surmounted, especially if you pick a good game engine.