Show HN: Orbital Typo – HTML5 typing game that drills symbols and alphanumerics

I like to play typing games when I have a down minute, but I couldn't find a game that would let me practice the symbols I use in my day-to-day work as a programmer. I wrote Orbital Typo to fill that gap. It's my first web game. Marketing ideas would be much appreciated, as I don't have much experience in the advertising space.

The game itself is about 5KLOC of javascript code. I didn't use a game engine. Reasoning about the game structure and handling design dead-ends and workarounds was actually one of the more enjoyable aspects of the development process.