Bullet hell shooters are tough to get right, in that you want them to be challenging but not too challengin. This unusually punctuated one threads the needle nicely. From the 4.5 star review from 148Apps:
That’s the beauty behind .Decluster Zero: Bullet Nocturne. There’s so much going on when it comes to learning when to use your homing laser, when to activate charge mode, and so forth. A written tutorial makes things sound a little confusing but practice makes perfect here, with .Decluster Zero: Bullet Nocturne offering a varied selection of difficulty modes that really do make a difference. It’s a real delight.