I love the idea of a time eating god and think you made great use of the decay theme! At first I was wondering how I would possibly eat all the time in the planets, then I unlocked the unstoppable upgrade lol.
The story parts were well written too, and helped emphasize the dark, hopeless atmosphere in the game.
I felt like the game could've used more sound effects though. Maybe sound effects when you're clicking buttons, or sound effects while devouring the planets? It'd be really cool to have some sort of feed sound while devouring!