Being a typing game, I just assumed it was supposed to be difficult, heh. Still, good job on this. It's a good foundation for whatever you do with it next, so good luck on the updates.
If you're taking suggestions, I would recommend enlarging the text that shows when you type and maybe slowing the enemies just slightly. Not a lot, but enough so you aren't getting swarmed after one mistake. Maybe add a mode so they go faster the more you mess up.