The game looks and sounds very nice, and the general tone and esthetics are fabulous too! I would say typing games is a very hard genre to deal with, given that there isn't much to improve on. But I think you all did quite a good job with this game! I like it a lot!
With that out of the way, let go with some criticism. First things first, Nullify is spelt wrongly, which normally isn't a big deal, but this is a typing game we are dealing with. I am also not too happy that I need to move my hand over to the mouse to either restart the game or go to the next level. For a typing game like this will be very flow-breaking to do that. Either doing keyboard controls or better even, typing out the command (Next, Restart) would be nice. I am also a bit mixed with stopping the character mid-move, but I am not going to complain about the design. Rather, I think using ESC to stop the character isn't the best idea here. It also breaks the flow a bit, and worst of all, ESC have a special meaning in games and web, which I don't think is a good idea to use in the game. (It's also not in a traditional typewriter too.
Anyway, this is still a very nice entry, so keep up the good work!