It's based on the Unreal Engine 4, and as we know with Everspace and RUINER, Linux versions that are looking gorgeous and have great performance are doable, even though not straight forward to create.
Asking if they would also release a Linux version, the developer replied with:
Right now, I'm unable to bring the game to Linux. But according to demand after release I might push it.:)
If you would be interested to see a native Linux version of SpaceBourne to explore space, add the game to your Linux specific wishlist and/or let them know in the steam community forum.