Did you know that there are two health bars? One of which happens to recharge pretty quickly
I just looked at the code, the inner health bar recharges at 7% per second, so a full recharge within 14.2 seconds
The outer health bar recharges at 0.7% per second, I originally had it not recharging at all!
The game is supposed to be hard, granted it's a little too much right now but it's easily fixed through testing.
You're supposed to be blocking the hits with your shield or armour, an armoured hit lowers your inner health bar, the one that recharges really quick, it's only when you're hit on skin (and you see the blood effects) that your outer health bar decreases, this governs the inner bar so it limits how much armoured hits you take.
Also, taking a hit to the arm does about 10-20% damage, while getting hit on the head (no helmet) does 60% damage.
Where you get hit actually matters.
The game is a lot more complex than it looks. :D