First you need to understand that the passage of this game is not just passing levels. There is no need to sit for 6 hours per day to complete each level, it does not help. To be successful in this game, you need to develop your reaction, except for this practice is needed as well and rest. I have a good progress, and I play for 20-30 minutes, 2 times a day. I do not see any reason to play more, fatigue begins.

In the game itself is also important precision movements. So, if you are right handed, do not play the usual WASD, playing on the arrows, you get a more detailed response.

And another thing is my personal observation. It is imperative to concentrate on the game and try not to worry in case of failure (which is constant in this game). You need to breathe deeply and calmly.

This is all the tricks that I use during the game. Good luck with achieving 6/6 achievements!