I'm glad that you feel strongly enough about it to post your feedback!
I agree that the sprint could use some work. The enemies do the same amount of damage that you do. Blocking is only useless from certain angles. It stops 100% damage if you're facing them. I can increase the healing, that's a good point.
Enemies in the sneaking section don't attack if you wait too long. They can see pretty far. It's always seemed stupid to me when enemies can only see 5' in front of them. I would have liked to make them see farther, but I think there is a balance there.
If you're crouched and behind them, they won't notice you. If they notice you, the door closes. The point is to prove your sneaking ability. You're being watched.
A player posted this walk-through on Discord. This was the 3rd attempt. It's supposed to be a challenge. You're not expected to beat it on the first try. I fail in testing regularly when I'm not being careful. https://www.pornhub.com/view_video.php?viewkey=ph5bc60ac2839bb
Thanks for checking it out. Let me know if that makes sense.