Hey, thanks for playing!
If you're pressing tab to inspect your Tamabuki make sure you're not moving around or aiming (I've updated the itchio game page to reflect this). I hope you get a chance to do this as I'm proud of how the pixel art attached to the Tamabuki's screen turned out. (Also, beyond eventually killing the monster there isn't much to do past inspecting a few different points of interest in the small map.)
And thank you for the feedback. I'm aware of the player being able to get off the map (lol). I did fix one passageway before I uploaded, but I didn't realize how many other ways you could get off the map at that point.
I'm not sure what you mean by the character behaving weirdly when they go up the stairs. I think you might mean how they teleport up each step and yes, that is a feature of Unity's character controller (it does look odd, though; in the future I'll likely stick to just coding my own controller and interpolating the player up the steps or using a sloped collider).
Finally, the blur is a post-processing feature (motion blur). I added it in because I liked it, but in the future there will be an option to turn it off. I'm sorry it bothered you!