Seems I was having bow practice.. and would go get my arrows when I noticed the the arrows went through the drawbridge without stopping. I found the arrow on the other side in the dirt. I shot through a wood door with the same results. Now I think a drawbridge should provide protection as well as a door.. Any chance for fixing this?
Trello update: The last weeks we've been improving the terrain generation and we've also put some effort into making landscapes smoother in general (to avoid bumpy terrain). Apart from that, we've also been working on new building tools. You find more information on Trello, but also expect an announcement about the recent changes soon