My game Star Explorers was started well before (6 years to be exact) this jam. However, the theme does actually fit. The game is about the human race looking for a new home after the earth is destroyed. This planet is, and has been our heritage as a species for as long as we have existed.
Another way it fits is a bit more challenging. In the game, the player may discover ruins of an ancient alien race. Within their temples, you can find certain tablets, that tell of their vast civilization. It describes the heritage of this alien culture in detail. It also serves as a kind of warning, showing some of the mistakes they made, and implying why their "great" civilization came to an end.
Finally, the game has loading screens. I included screenshots from the game during these loading periods, which can last between 15 and 40 seconds or so. But I also collected as many quotes about space and space travel, from as wide a variety of sources as I could find. I have quotes from scientists, astronauts, artists, authors, religious scriptures and more, all showing the human race's long time fascination with outer space. I believe that space is indeed part of our heritage, and it is the thing that binds us as one people. I think, recognizing that we live "in space" is an important part of being able to see that we are all really one community, and we do not need to be divided.