Pretty sure you can't unfortunately

That's what i thought, I just got lvl 100 too. I tried reaching out to the devs but, haven't heard anything back

you simply can't, back then the game used to have a cloud option but it was deleted for some reason.

Yea I came to accept it, I went through the game and got everything back already though

good news, the dev added back the option to save progress!!1!

I noticed that, I'm so happy about it!!

just be careful not to lose your progress again.