I was waiting for one of these types of "ends in 2030" games to show up! A nice twist on those Twitter bots.
If you want to improve this in the future, maybe making the background serene like the thumbnail could be cool, and trying to incorporate a lot of synthwave/vapourwave styles of colouring, using garish colours like magenta that the slider could gradually turn into being green depending on its percentage. Also, if you did something like this and used a sea front like the thumbnail, you could turn the sky into the slider or have it change based on the day or season.