Just got this Super Nova cart, over the weekend, and played a bit of it, last night. Released in the same year as DDP (1997), it shares both similar bullet patterns and a single pixel hit-box. One of the boss's bullet patterns was very reminiscent of Lady Gara's statue attack, which is impressive being as this game predates ESP Ra.De.
Pretty fun game, actually

I must say that the Vulcan options are the most aggressive options I've seen in a shmup.
So, in the title screen I noticed that this is a work of Warashi, the same folks that brought us Shienryu. The flavour of the graphics show the relation, too.
So, my overall assessment is: you mix Shienryu and DDP, add options, and you get Sengeki Striker

-ud