Nice one! I'm a touch typer myself and enjot typing games.
Some feedback:
1. It's a bit inconvenient that typed text is shown only at the bottom. I wish I could see it under the bugs word which I'm trying to type. This way I can control what I type better
2. Hit Enter to erase typed letters. If I'm trying to kill a long-word bug and fail I have to spend extra time on erasing what I typed