This is an excellent creation - well done! For me the game is immediately reminiscent of Solar 2, with a different "spin." The use of black holes for sling-shotting is a simple but effective obstacle as the player collects the lights.
It feels as dark/lonely as it should thanks to smart use of "shadow" being the majority of the game space, as well as music selection. Thank you for such a polished and immersive experience. I am excited that you plan to continue development!