I'm glad you liked the spritework! While I have some art experience, this was my first time doing pixel art and animation, so it was an interesting challenge figuring out how to make it look roughly how I wanted in an unfamiliar format.
To be honest, the screen size and vision radius were chosen pretty arbitrarily. In retrospect, I could have sized the game window to leave less black space at the edges and maybe zoomed everything in a bit to compensate. That sort of thing hadn't even occurred to me during development--I was too busy frantically trying to get the game to a state of "technically playable" before the deadline.