Skins shop with prestige points + Save is now kept between updates

Hello,

I added a skins shop to change the background of the game & to change your upgrade buttons skin!

To access the shop, click the  little purple icon on the bottom left of the screen.

You can buy skins with prestige points, and you get 1 prestige point each time you reboot.

Furthermore, from now on, your save will be kept between the game's updates!

Cheers