No, those are not really bugs.
As I explained in a different topic, you can't place steps higher than the first floor: https://itch.io/t/1906651/stairs-on-different-floors
The transparency problem is a common problem with 3d projects and I'm still trying to at least make it not as obvious. Note though that there might never be a solution as it is not a straightforward and trivial task. For now the only decent solution is to use models instead of tiles for transparent walls. The manual for models is on the go and will be added soon.
No, this is the right topic. I just decided not to create two separate communities for what is essentially the same project.