Only the dialogues. Walking around seems to work okay still. I got most of the way through the game but got stuck (not due to a glitch or anything as far as I can tell, just not sure what to do next) so I'll have to wait for a walkthrough.
I haven't find the bug's cause yet but I'm searching. What version of Windows do you use?
Also, I asked the developer of the game engine. The bug could be the consequence of using the Alt+Tab combination, to switch from another window.
When switching back to the game, there's a bug letting the game think a key is still pressed... and the consequence is that it skips the dialogs...
Oh that's probably the issue then. It didn't happen every time I tabbed back and forth between windows, but it's quite possible that could be the culprit. I'm on Windows 10 Home, if that helps.
I did quite enjoy the game (for the most part) and finished though. It was a very interesting/different experience as to what I was expecting initially, and I liked how it surprised me. I'm hoping to review it in more depth soon.