Javascript Game Engine? Maybe ;) (No Audio)

I have been playing around with learning Javascript / canvas type programming. I found this really good tutorial on how to make a "game engine", passed that point I went off and made my own custom buttons, labels, etc.

[Tutorial Link] https://youtu.be/5otlt9dCbnc ... https://www.youtube.com/watch?v=Tq0G2G0UYaA