If, as there, one swipe gesture per letter is allowable, rather than a gesture encompassing a whole word, then things like Thumb-Key become options.

* https://github.com/dessalines/thumb-key

It has a similar sort of 'It doesn't have to have 26 keys on something the size and shape of a mobile 'phone.' thinking as 8vim has, whilst raising a good 'You know 'phones worked fine with a 3 by 4 grid for 60 years, ne?' point, but adding a modern twist of 'We can swipe, in the 21st century.' to the old notion of multiple letters on a button.

There are still these people thinking outside of the typewriter-keyboard-on-a-'phone box. (-:

I really liked this in the day (and i just played with the version you linked and can still remember all the key patterns - I'm typing this comment with it now).

But it just can't touch swiping for speed. Frankly, the keyboard I miss most is the T9 predictive text from my old school pre smart phone era.

Nothing has come close to the same expressiveness and speed while being usable completely blind, only by feel.

I do feel like mobile keyboards have stagnated in a bad spot, though.