Gameplay 3/5 - Simple but it works well. The ability to run would have been nice but not a deal breaker. Maybe add in some kind of narrative for your next game, just a little something to say who the player is and why they're doing whatever.
Creativity 2/5 - It's fine for a new developer who's learning.
Art Style 3/5 - The low-poly assets looked good. The player character was a bit mismatched with the environment but it wasn't too bad. Having things turn clear when you walked behind them was a nice touch.
Audio 4/5 - The music and sound effects were good. Maybe could have used a few different sounds but hard to complain here.
Theme 5/5 - It definitely fit the theme and I like that you mentioned specific real constellations.