Hello. I've encountered an error when clicking on the blacksmith's door and since I forgot to save, I lost 3 hours of progress not counting the time I was trying to figure out the cave puzzle.

An autosave system would really nice and essential to have..... 

Ack, sorry to hear that.  That bug seems to have reared its head again, so we'll take a look at it!  Autosaving would be a handy feature to have too, so it's something we'll keep in mind for the future (it wasn't something that crossed our minds until... well, after we released, bahaha)