I had a look at this app to see what relevance Lens review had and I can say: Not much.
The app look OK, good features and functions, with a good layout. The interface might be a little bit on the dry side, but mind you, this is a app to use professionally, not a game. I worked in accountancy 20 years ago and whilst working you want to keep distraction to a minimum. So in that respect this add is fine.
Also, I can not see that there might be confusion regarding what and where to click and the it is a plus sign not an X. That I am sure would be clear to all and sundry. A plus sign is used, as we all know, in OSX among others. That it is viewed slightly from the side is fine by me.
I must complement the developer on the gentile and respectful reply to an unfair and slightly aggressive review.
Well done. You are a kind and considering person.
And good luck with a well constructed app.