Available as an android app at Google play.
You can play it online at https://online-gamehub.com/games/mem, you have to register an account first and buy it with virtual currency though.
Building from source
You can play the development version by just opening index.html in your web browser. If you want to build it and run the release version you have to install
npm install uglify-js -g.
To build the game, just run
rake in the main directory. The game will open in your default web browser.
The game is released under MIT.