Hey Evan, I'm sorry it deleted all your progress! However, I'm afraid there's not much I can do there; I do my best to keep your save files but some browsers just like to delete files for random reasons (e.g. if there's limited space left on your device). And I don't really have the resources for a cloud save system right now.
However, I can offer you a save file with enough resources and people to hopefully help you get back to speed a bit quicker: https://florianvanstrien.nl/files/TheFinalEarth/saveWithLotsOfResources.sav (right click/hold -> save as, then import it in the game with the Import... option in the game menu). If you want this for another scenario or need help just let me know.
In the future, I recommend Exporting your save regularly to a safe location on your device/the cloud. You can do this from the game menu as well. This doesn't work on Apple devices right now, sorry.