It's a simple stat calculator with 88 events and 3 small images o.o
It's not a game by any means I just can't really see how 3 Images with 88 events = 101MB :/
Your program - 1 MB, NW.js wrapper executable (Chromium browser engine) - 100MB. (Not exact, just for example)
Basically, most people already have a browser installed so you don't need to bundle the browser engine. Just export as HTML 5 and it will run in whatever people already have installed.
The main purpose of NW.js is to create an executable file for windows on a controlled platform. So for you, you don't really need NW.js and thus your original statement is correct in a way. Doesn't mean it is worthless for others who find it useful though.