You can get pixel perfect fonts.
1. Use tk2dCamera so the font is the right size, and you can position them correctly, easily.
2. Disable mipmaps (important) & use point sampling. If using normal textures, switch to advanced to disable mipmaps.
3. Make sure they are the right size on screen, and they are on a pixel boundary. tk2dCamera really helps here. Use default size, make sure position is a round number.
Most of the demos simply scale to fit the screen and use mipmaps for lower resolution. Obviously that will be blurry. Those scenes are meant to scale to fit whatever resolution
Load demo 11.
Note "Lives" is slightly blurry. This is because its not on a pixel boundary (and it has mipmaps... but we can get it looking better even with mipmaps). Select it, then change position to round numbers. -11, -12.
Yay. Sharp text.