I like Fouita, I've been building some great widgets! I deducted 2 tacos for two reasons:

If you are editing a widget and hit the main back button, you lose everything that you have done. The button shouldn't be so prominent. It's very easy to hit by accident. I have trained myself not to hit it and I still sometimes hit it subconsciously. I have lost work from this error.

I would make it a cancel button, because ultimately that's what it does. It cancels the editing work you have started and takes you back to the menu section. I would also make the Save button a one-click function. The Next button could still be there, but a Save button right next to it would be desirable when editing widgets. If this gets addressed, then I will update this taco.

There could also be some improvements on the editor and some better tutorials or a help section, but once you get used to the interface, it's pretty good overall.