It thinks "false" is two syllables, which seems to be just a dictionary problem. For something like this, those need to be very diligently squashed if you plan to make something commercial out of it.

The editor is way too small - this is a really simple fix.

Finally, I'm not sure why this is all in PHP - it seems like this would be much easier to use self-hosted or otherwise packaged if it was client-side only PHP and Javascript. It doesn't look like the program does anything which couldn't be done that way trivially - please correct me if I'm wrong.

In other respects, this is pretty basic, but very well-done, particularly for a hackathon project. Nicely done!