This is an excellent demo; it kept me on edge throughout the entire experience. I’m not sure if you’ve already planned this, but for the final version, I think it would be interesting to add a bit of story or context, even something as simple as: 'Today I want to go camping; it’s the best day to see [X] stars.' I think you’re developing the idea very well, and it perfectly achieves its goal of keeping the player in suspense. I’d love to play the next version when it’s ready.