Very novel concept, especially for a typing game. Took a while to get used to, since you have to factor in for a space on phrases in later levels. Would be neat if there was an endless or random mode, so that the player wouldn't be able to memorise a set of words for a given level.

Took a while but I managed to get A rank on all five levels, I'm guessing there's an S rank if you get all perfects?

You guess right! You can get an S rank for getting (nearly) all the letters perfect.

There's a lot of good stuff here. The concept is neat and it's pleasing when you get the inputs right. The pixel art is simple but clean and fits nicely together. The SFX are likewise simple but clean and pleasant. Keeping the wave alive is a good use of the theme. It's lighthearted and pretty innovative. Nothing bad to say about what's here; I'd play this again if you continued to improve upon what's here. Nice!