Welp, it was a BUG. I saved my progressed and then left and reopened the game and now I can talk to him. ;/
Thank you, I will have a look at this. It's an early version, alpha stage, so expects crashes and bugs. Anyway, thank you for reporting it. I hope I can publish a new version this week with some bugs fixed.
Oh an update. Well, I have you followed so I'll be looking forward to it.
