Hello!
Yes, it's made in Godot. However, it uses a custom module for large scale orbital computations. Thank you! If you have time, of course, I'd appreciate any help.
Clone the repo https://github.com/z80/ignition. Releases are in the "master" branch.
Godot with the module is in "/godot" folder.
Run
"scons target=release_debug tools=yes" for godot editor.
"scons target=release tools=no" for godot redistributable version.
The game project itself is in "/ignition" subfolder.