Thank you for playing!
Yes, UI and mouse for long lists were unfortunate issue - it meant to be played with keyboard easily and there wasn't much time to fix it for a mouse control fast enough.
With the corridor - I agree, for now its only outside of the game we have a hint (in the description)... well and minimap. But that area is also not needed to progress further, so we hoped it would be ok even if people get lost there :D Decided to make it like a small bonus area, but, I guess, it didn't help that its not as secret as it could be and not really hinted that its optional quest either. We could tag it as such for sure >_<