Thanks for playing!
The poise thing was an addition i made in a previous version due to the hit stun being too frequent. The idea is that each point of hp damage also damages your poise. When pose is 0 you are stunned for a short amount of time. This is to avoid a "chance" of stunning the player, which can become very frustrating very fast.
Anyway, thanks to testing the Linux version, which i couldnt even test myself! The wall situation is on my list, its a bit tricky and i forgot (or failed) to make the wooden struts transparent too if the wall is supposed to be see through. Lighting problems are new to me, but i will check it out. Theres this thing with some materials loading incorrectly, at least that happened on my laptop a few times.
Do you recall how exactly you got stuck? From the screenshot it looks to me like the character is standing on a spot where no valid navmesh exists if the door is closed. I'd hope it would fix itself once you open the door again, but you probably tried that, which means i need to investigate more.
Glad you liked it despite not being an orblike fan!