Great start!
The best part is definitely how detailed the system is. A few chapters in, and you are looking at stats and upgrades with descriptions just like in an RPG game, which is great!
The MC seems to be pretty smart, and the world is shaping finely around him and the system.
One thing I noticed was some paragraphs were quite long and could definitely be broken into 2 or 3.
I don't personally have too much of a problem with it, but lots of people can't keep their attention for a paragraph over 5 lines.
Not deducting points for that since a few edits would be enough, keep it up author!