What's your favorite bullet hell? I was craving one a while back after playing Cuphead, which I know isn't really a traditional bullet-hell, but it has some elements of one.
You can get it dirt cheap during a sale and it was designed to be mastered like an instrument. No cruft, just you, the boss, and some bomb ass music.
The game has a TON of little ways you can optimize your playstyle and power down the bosses while still being incredibly fair with it's mechanics. I go back every year and beat it again
I believe it is still on PS+ if you subscribe to that. That was the first game I played on mine because of that, and how I came to love the adaptive triggers on the DualSense.