Hello there. So on a very early stage of the game, right after prologue and building first building in the village as instructed, I clicked Valerius' House, then notice board and I started the first quarry mission. Then as I run into a problem (on my part actually, as I described in my post Quarry bridge), I wanted to try again as I found myself stuck.
The problem is, when I click restart button, all I got was an endless (literally, I left my laptop to do other things and after a long time nothing changed) loading screen. Don't get me wrong, the art is very beautiful, but I don't think that's the point of restarting :)
After closing the game (alt+f4) "continue" button in main menu did not work. Starting a new game from main menu fixed the continue button (obviously continuing the new game), but I did not attempt to restart again.
Also, no need to apologise, bugs and stuff are completly normal, what matters is that you acknowlegde this. It's great that you care, keep up the good work, your game has huge potential :)