A simple Top Down Shooter written in Javascript. It is using the Canvas API and no external libraries.
The aim is to show how to start a simple game and how the underlying techniques work.
You can try it here: https://nkoehring.github.io/FreddyvsJSON/
If you want to learn how to make something like this yourself you may check out the well documented source code. I also wrote a rather extensive blog article, that goes describes the process from the bottom up (ha ha, pun intended).