[gobr]

It's cool, but needs a lot of design, it's very raw yet.

One other thing, the program should not allow me to click anywhere, like, if I start to make a word in horizontal and them click 4 columns on the vertical he shoul not compute that, or something like this... (I don't know if you can understand this without some screenshot)

polish, polish and polish more. :D

[vColin]

I think I know exactly what you mean - restrict the highlighted letters to be in a single direction.

Something I was considering was changing the selection mechanics so that you click at the first letter and then drag to the final letter before releasing. I think that would be more intuitive.

Yes, I agree it's raw, almost embarrassingly so. Still, release early and iterate!