Hey Eduardo, saludos desde Argentina!
I tried the tileset generator, on HaxeFlixel. My tiles are 35x35. Used Bitwise export option.
Here's the input:
Here's the generated tileset:
Now, there's some things:
First of all, the generated tileset has a gap. Not sure if that was intented, but is visible.
Second, there's some cases where the tiles just won't be placed properly. Works 90% of the time, but a bottom left corner ends up missing sometimes. Not sure if is a problem on Haxeflixel's end or what.
Regardless, is a great tool, super practical, but wish there's some way to make it work perfectly.
If you know what's up, please let me know. Thanks a lot!
EDIT: tried your original tileset, same results:
EDIT2: Just noticed the tile gap is not present in your tiles. Perhaps it was a problem on my image input.