Is there a significant advantage to using this over regular vim? This looks like just a gui on top of it, which defeats a lot of the "Don't use the mouse" functionality of vim. It seems to be shooting itself in the foot, why would you give the ability to click to options rather than making it easier to get help via keyboard?
(This is as a new person to vim, who still has to look at a cheat sheet regularly to do basic things)
I felt that way, too. One could argue that many modern GUI features are more of an excuse to use the mouse, as opposed to actually taking advantage of anything that a mouse is good at.
Even text selection, which ought to be fast with a mouse, is slow; it's hard to precisely click the end points, and the target may require scrolling in order to make it clickable. When you can do something like "3dw<return>P" (move 3 words to beginning of next line) instantly, the mouse is almost never more efficient.
(This is as a new person to vim, who still has to look at a cheat sheet regularly to do basic things)