This project was pretty much born as an excuse for practicing my knowledge on basic HTML + Vanilla JS. It ended up quite nicely I'd say.
I decided to make it based on Helltaker, which is a free game that came up recently that people really liked it, if you want to give it a try it's free on Steam.
The project was heavily inspired by Satania.moe, since it has such a wonderful boilerplate and design for the page I wanted to make. Props to Pizzacus.