I discovered the game gave you three shields (hit enter) which definitely helps, but since I never found instructions on that, I looked for more info online. I was surprised to see many people saying it stayed too easy too long - talking about getting to levels 25 and even over 50 without effort. At first I thought they must really be great typists, but then I saw some who said an "expert" version was coming.
I checked different sites and, sure enough, one had a choice on each game of the normal level or expert:
Funny though, neither one was the same as the link I originally had in this thread. The "normal" started out harder than what I had and there were no shields, but it progressed very slow so I could do far more levels. The "expert" was really tough and also had no shields.
Anyway, there is the link so you can choose from 3 different versions.