This game has earned its "hardgame" tag. It took me a while to pass level 3. Spoiler alert, below at the end -- but not really, given the difficulty level. As the tutorial advises, every millimeter makes a big difference. The grid is a good idea; otherwise, it would've been too difficult.
Taking joy in this game's difficulty is comparable to the times when one craves the spiciest hot sauce available. This makes a good addition to NG.
Easter egg? The space key resets the trial. So when the result is starting to appear too redundant, but you don't want to lose your cursor's position (every millimeter matters), hit the space key instead of the on-screen "RESET" button.
L1: somewhere in between A1 and A2
L2: somewhere around 7A
L3: somewhere in between L30 and K30
Good luck with the rest of the levels.