Kudos to you for making a boss that's actually fairly smart in knowing which doors is open and whatnot. While I never did get the samples (I should have paid attention to the intro more), it's also refreshing to have a boss be just a guy with a gun. No supernaturals, no hyper crazies. Just a guy trying to defend his home. XD. I'd just increase the walk speed a tad bit.
Here's my channel for other games I have played. https://www.youtube.com/c/Levont