nazrin's patterns are pretty good and the art is really well made, but the game has a lot of bugs, most especially the problem with invulnerability. I also like the idea of the bomb making bullets small rather than just removing them.
Some other things I noticed and not said below: Power seems to not work? Or might even have an opposite effect because it felt like my damage at 3 power was weaker than 2 power. It's very hard to tell though when there is no visual difference between every power level. Though it also does feel like enemies (including the boss) are way too tanky in general. Almost every phase was a timeout even though I kept being below nazrin.
The music for both the main menu and the boss doesnt loop.
Your pickup hitbox should definitely be increased. If it's the same as the player hitbox then I suggest separating them. Also, I assume the item speed when you reach the PoC is lerping the items to the player, but that gives an awkward effect where their speed when closer to the player is slower than the player's actual speed. So the items never reach you if you keep moving. I had the same problem in one of my shmups when I lerped item movement too. I suggest making them move at a constant high speed instead. That'll make it much nicer.