Because when you play a game in the browser, if you press up, left and space at the same time, most spacebars don't work, so I decided to use "WASD" instead. If had used "ZX&C"+ arrows then I wouldn't have a jump button! In order to have the right hand use keys I typically default to "JK&L". There are many games that do this, but yeah, I probably should have had some options for right handed movement.