The fields in the value column don't look editable at all. They give the impression of text being displayed.
I attached the way they look in phpmyadmin. As you can see, the text fields are far more obvious.
In the create_table.png the select box is not viewable until you click on it and also the other editable fields are unclear.
Also, a small error should be displayed when clicking Save (when creating a table) without filling all the fields.
For example, consider the following scenario. The user says he needs 5 columns, but in the end he only needs 4. In this case, it is recommended to save the table ignoring the empty column names. Currently, there is no way for the user to change his mind and reduce the number of columns.