My computer crashed to a reboot and I lost all 211 levels of progress.
This game is great, except for one game-breaking issue: no cloud save. After my computer rebooted while the game was running, I could not launch the game without crashing during the intro animation. So I did what anyone would do, and uninstalled/reinstalled the game. While that fixed the game loading problem just fine, all of my character progress is gone. I guess I'm too accustomed to playing games on Steam and didn't even think that my character data would be a) entirely local, and b) not saved to local Windows app data where it would be safe from uninstallation until manually deleted.