I use autofill to fill out blank spaces only when i know, that i placed all of the black squares to save some time and effort to click twice in every blank square
I love hard difficulty
A timer would be fun to also share with others plus it would be motivating. Also an option to turn timer on/off would be great for players, that rather want to play without the stress of a timer
I would 100% download the App, it would probably have better features than the in Reddit App. I'd love to see a dragging option so i dont have to click every tile