Amazing execution on the theme and restrictions! Beautiful music that really fits the mood and environment. I LOVE the occasional planets and ships/satellites passing by in the background, a nice touch. I got pretty stumped on how to get a few helmets on 4 (for sure) and 6 (I think), so I didn't end up finishing all of the levels. There is a slightly irritating text bug that I'm sure you're aware of - the whole dialogue line flashes before it begins to type out. Regardless of these issues, it's a great game with great design and clearly has effort and care poured into it. Nice work!