I had to switch relative melee off to feel like I had any control over the bat, but once I did it was fine. Could potentially use rmb to toggle relative mode on or off rather than it being a menu setting?
Would be good for the game to be more selective for when the slowmo death animation happens, if there's one enemy in the corner and you just shoot to finish him off it probably doesn't warrant a slowmo moment. However if there's also too much happening on screen it can be very bad for awareness.
I didn't even realize the steam vents in the 3rd area damaged you. Here is the first time I got to that long corridor after the grenade launcher guy without knowing the vents were dangerous. I think this is because there's usually so much going on at any one time I don't know what is actually hitting me.
The character being white and the hat being white makes it hard to always be aware of when you're wearing the hat and when you're vulnerable. I guess you don't want to change the design to a different colour hat but maybe some other cue would be in order.
Linux build runs fine btw.