I bought 1.4, tried 1.4, 1.3, 1.2 and 0.5.
I got the save issue in every single version, despite of the 0.5 ages ago. Erasing data or cache didn't work for me on my S24U 🫤
It doesn't save my progress at shutdown. Everytime I start the game, I'm starting from beginning with 400 heartpoints, no purchases and nothing unlocked.
You mentioned to clear the cache and data in android app settings but that didn't work as well. Tried it on a different device, too. Same issue.
Why don't you code a save button into the game if autosave fails? 🤔 😅