Didn't play kind mode but played on mean so I can't say i'm not sure how difficult kind mode is. But, based on some of the previous threads, other people seem to be struggling too. Personally, it took me around 3-4 hours to just beat mean, it was a lot more difficult than I expected :/ (had I known about the bullet hell minigame I would have lowered the difficulty before starting the trial).
The best strat for me was to stay near the left side of the screen at all times, if you do that you can just focus on moving up and down to to dodge most of the attacks in phase 1 and 2. Some of the attacks like the red targets for phase 1, you'll need to move around but return back to your original position. And if you're playing on keyboard, have one finger holding down spacebar at all times, you'll end up hitting most of the statements for the mega bullet as you move around. In phase 2 and phase 3, it's important to use the shift key to slow down to dodge the hard-to-dodge attacks. The key thing about this is to try to memorize some of the attack patterns in each of the phases, so you know when to use your mega bullet. I hope this can be helpful to you guys and anyone reading this comment despite our different difficulty modes!!