The game has been updated to include an autosave. Redownload and overwrite the old files.
Viewing post in Idle Dargons Think of Treasure comments
I've moved on from this project and am working on something else that's taking a lot of my time, so this game will likely only get bug fixes, balance changes, or needed features like the recent autosave update.
If you want, you can follow development on my newer project (a skilling RPG set in the same world as this game) by following my twitter account https://twitter.com/dargsy