Important thing to remember here is Dodonpachi Daioujou/Blissful Death predates Daifukkatsu/Resurrection by quite a few years, so this is the prequel.
Blissful Death shares a lot more in common with the original Dodonpachi that you might have played in MAME, and is generally considered to be the hardest DDP in the entire series so far.
Whereas Resurrection based the scoring system around bullet cancelling to builld up hyper gauge, then storing your hyper and chaining, Blissful Death is just raw chaining.
There's no bullet cancelling at all - everything must be dodged or bombed out. There is also no leniency with building the hit counter. It doesn't just decrease once the gauge is empty, it completely drops. Every time.
Hypers also work differently. You have a hyper gauge that you fill up on chaining and bee collecting (bees fill the chain gauge more when your hit counter is higher), and every time the hyper gauge fills up, an item drops from the top of the screen that you need to collect.
You can collect up to 5 hypers at one time. However, these don't stack. Once you use the hyper, they ALL get consumed at once, and the hyper count dictates how fast your hit gauge goes up.
You have a choice of two ships - A Type, which is a straight shot, and B Type, which is a wide shot.
You also choose from three 'dolls'. These gauge your power. Shotia increases your shot power, Leinyan increases your laser power, and Exy increases both of them, but only gives you a single bomb instead of three.