Aw man, I just picked a mouse speed that felt good for my mouse and never got around to properly tuning it or providing an adjustment. Sorry to hear that it was too sensitive for your setup! I can definitely see what you mean with the movement being a bit too floaty as well, so that's good feedback!
A UI of any sort would have been a great addition for sure! I'm still trying to figure out how to make sense of Godot's UI controls so I didn't have quite enough time even though the intent was definitely there. I hope you had fun exploring and thank you for playing! :D