I once thought that song was about mortality and the necessity of carpeing that diem, but it turns out Pink Floyd were stealthily pitching the core concept for Erosion, an open world roguelike shooter from Plot Twist in which the world advances one decade when you die.

For some reason the phrase "carping that diem" had me chuckling.

https://store.steampowered.com/app/3211720/Erosion/

Link for those who are lazy.