Remember that scene in the Avengers where Tony Stark mentioned that some guy was playing Galaga? That was the first thing that popped into my head when I came across Alien Invasion.
Yes it’s true that with HTML5, it is much easier to develop web and mobile games in 3D. Still, some game developers love a touch of classic console-based games. It somehow brings about good old childhood memories in them, but this time, they relive it right on their web browsers or their mobile devices for portability.