Great what you've accomplished so far!
Many have already suggested adding adjustable mouse sensitivity (and that would be great) but I've not yet seen a bug report regarding this. The sensitivity seems to be way higher on the up/down that it is on the left/right movement. Maybe on 16:9 monitors it isn't that obvious but I have a 3440x1440px ultra wide monitor (so approx. 21:9) and there it is very noticable.
One other thing I found using the F3 debug UI is that I can't get more FPS than my monitor has hertz - even when disabling vsync. But I guess that's not a major issue.
Keep up the good work! I really love your game development videos!