Reasonably well executed. The music is very repetitive; it'd be nice to have an option to mute *just* the music.
However the real reason for the 2.5 stars is: while you've tried to come up with a new iteration on the word connect genre, I'm just not convinced that what you've created really works as a concept. That is, I understand it, but it's far too simple. Connecting the shapes is just a simple chore, while putting letters together is trivial, since the letters can be chosen in any order (i.e., they do not need to be linked).
Don't get me wrong; I am a fan of the genre. It's just that I really believe people will find this game somewhat easy and probably a bit boring. If you want to keep the gameplay mechanics as-is, then you might consider rebranding this as a younger children's game, targeted at a younger audience. That's not meant as an insult! Good kids' spelling games are sometimes hard to find.
A "relaxed" (untimed) mode would be nice, as well.