Really clever and fun take on the theme, executed fantastically. I did one run where I scraped by with 130 years remaining (thank you Asteroid Mining and the Generation Ships) and even with that I could tell there's a ton of replayability and build variety.
The presentation, while simple, was also super effective. I love how your time left is shown by the big title in the center of the game and the way the earth spins faster around the sun when you take an event that makes you lose time.
Overall a truly incredible hidden gem of a game, great work!