>>717398540
Its all about pattern recognition and finding safe gaps in a maze of deadly walls. As impressive as a boss filling the entire screen with projectiles looks, only 0,001% of those projectiles actually matter to you and you have to learn to dodge.

If you want the stupidly hard bullet hell type of games, go for Mushihimesama and its sequel. Final boss in the first game is outright unfair because its patterns are half random and can be outright unavoidable.