Is It Really Too Much to Give Monsters a Health Bar?

A young man from a modern city transmigrates to ancient times and becomes a hunter, using modern knowledge to make a thriving life for himself. He thought he was in for a life of eating raw meat and drinking blood, but it turns out modern knowledge is a cheat code! I use physics to improve bows and crossbows, doubling their range; chemistry to tan hides, producing leather far superior to my competitors'; and I even come up with a "preorder system," getting the wealthy families in town to pay in advance. Three years later, I've gone from a poor hunter who never knew where his next meal was coming from to a major landowner with a hundred acres of woodland. Now I'm figuring out how to raise livestock using ecological principles, and maybe teach the county magistrate a thing or two about sustainable development. Who says transmigration has to mean palace intrigue or rebellion? Put modern knowledge to work improving technology and livelihoods, and you can thrive just the same!