This is a tiny tip for who are stuck in between 20~40 seconds.
Too long term of play makes you nervous and tired and it makes your time spent longer.
In my case, this walkthrough below was very effective and I'd like to share with you :)

1. Basics : Get used to the new, RRLLL pattern. When you are, the average time will be about 30±10 seconds.
   
   
2. You have to feel this stage slow like when you play the first stage now. there are two ways.
   
   1. Play 'Open Hexagon'. It's harder and faster but you won't be under pressure cuz there are no achievements. Relax and just enjoy. It will make you calm down and your eyes feel the Hyper Hexagonest stage slower.
      You can DL it through this site : https://vittorioromeo.info/projects.html
      Here are recommended stages(contain similar patterns and speed) and its speed(difficulty) settings.
      
      • ACCELERADIANT(Hypercube Pack's 3rd stage) with 1.4~1.8 difficulty. Highly recommended.
        
      • Cube pack's 2nd~4th stages with high difficulty(2~3 for 2nd and 3rd or 1.4~1.8 for 4th).
   2. Watch videos which show the playthrough of this stage at 1.25~1.5x speed on YouTube repeatedly. If you try to sync your finger like you are playing at that speed, it will be more effective.
   
   
3. When you think you've spent enough time to follow these two ways, Try the Hyper Hexagonest stage again for a while.
   
   
4. If you become tired, follow the 2nd step again. Repeat this walkthrough till you beat the game.

Lastly, I want to say that the ending will eventually be yours.
In my case, My last high score before I cleared this stage was about 41 seconds.
Ending will come to you like magic! Go for it!