Simple concept, fun game. Would be interesting if there were features like streaks and powerups that could give you extra time.
I think you should implement this idea in a more exciting fashion. There’s a typing game similar to this called Nitro Type, but instead of getting the most amount of points in a given time, you have to race cars. The faster you type the faster your car moves ahead. In my opinion you should add something to this (part of the general player vs player concept) to make the game more exciting.
Unfortunately I suck at spelling