You can also just say ‘Criticism of the dictionary is increasing.’

It needs changes. I could find no way to say it as efficiently as you tried. Some options. The dictionary is receiving ever more criticism. The dictionary is receiving increasing levels of criticism. The dictionary is receiving ever more increasing levels of criticism. The dictionary is receiving levels of criticism still greater than anything previously seen. The dictionary is receiving levels of criticism greater than those previously seen. The dictionary is receiving levels of criticism yet greater than those previously seen.

Hello Emar. You could say, 'The dictionary is receiving even more criticism than before' Or.....than previously. Hope this helps! Regards, David

The dictionary is receiving more and more criticism.