this is the business-class airline ticket to bull-sh|tville.
Okay jokes aside, it's definitely one of the hardest shmup I've played. Its unique polarity mechanic provides interesting gameplay and difficulty unique to its own way, Ikaruga keeps players vigilant since it might catch the players off guard when they are collecting projectiles to charge your homing laser, there might be a bullet of opposing polarity hidden beneath the huge numbers of bullets you're trying to absorb, or giving players short time to make decision on which polarity they should switch to while being surrounded by huge numbers of bullets more than enough to block the sun.
the non-gameplay elements are impressive, eye-pleasing art-style and ship designs, another aspect that stick out the most is the soundtracks. Nothing gets you pumped up more than listening to the music accompanied with flying through the beautifully designed background. albeit I ought to say it might need some polish on its 3d renders.