Your game could be a prequel to ours; let's make a bundle! :).
Seriously, I really appreciated the simplicity and efficiency of the gameplay. Playing on the density of stars is a very good idea ! The dash is also incredibly satisfying.
The game could have benefited from a deeper feeling of gravity I think :
To really feel the density of each star and to have to leave the orbit of a white dwarf with the dash for example.
Nevertheless the game remainsreallyt pleasant and really efficient !! the atmosphere and the theme are clearly respected.
Great Work !