Thank you for great feedback!
We already made some improvements. Now the health level is always displayed when health less than 90%. Also we decreased default sensitivity. (BTW you adjust camera sensitivity in Settings, but I agree the default one was too high). Also we are working on other improvements and new features.
We are the team of 4 men. We are using Standard Render Pipeline in Unity 2021. Currently we are focused on single player game and multiplayer may be theoretically be made only after main game finished. Thank you!