This is a really cool vibe. I wish there was a mouse sensitivity option in the settings as well. I also hate to be the bearer of bad news, but the audio options a little wonky. The SFX slider works great! The master slider doesn't seem to have influence over the sound level though. I'm also not sure, but I think the music slider works too?
At the end of the day, this is a great start to adding UI to the game!