Noticed your comment to OneThousandMeeps, and wanted to give you a heads up that I came up with a solution to the problem with Unity losing save data from PlayerPrefs when you update and I posted the fix here:
https://3p0ch.newgrounds.com/news/post/1086279
Since you've already uploaded this game, if you were to implement the code now then everyone would lose their progress as of now, but then it wouldn't be lost any more during future updates. For any future Unity games it would be useful to have on board from the outset.
Edit: Players clearing their cache shouldn't make it lose data; the PlayerPrefs emulation still saves to IndexedDB.