If you didn't watch the video, the game is just a very standard multiplayer real time strategy. It's really easy to play, and really easy to start group games with friends. No need to register for an account either, you can play as a guest. There are some short tutorials in the game menu.
I linked that video because any more recent ones. It is a year old video. The game has gone through very many updates since then, according to youtube comments. I haven't played it much and was only introduced to me a few months back. It's a fun game though.