NimES: a NES emulator in Nim, compiled to JavaScript

This is NimES, a NES emulator in Nim, compiled to JavaScript using emscripten (accompanying blog post):

Games: Super Mario Bros, Super Mario Bros 3, Tetris, Pacman

Key	Action
←↑↓→	←↑↓→
Z/Y	A
X	B
Enter	Start
Space	Select
1-5	Zoom 1-5×
R	Reset
P	Pause