Hell yeah, demi! G-Darius is an absurdly ambitious game, and it's really heartening to see someone discussing its unique achievements nearly 25 years later, when so much of what it does is often taken for granted or undersold (it's a nice reminder of the qualities that drew me to it in the first place, too). One thing I'm enjoying about the HD port is the tastefulness of the upscale. It's a terrible cliché but everything looks as it does "in your head", with the sharp, angular models of the Silver Hawk and the bosses fairly popping off the screen at you (I still love how it looks in the SD mode, but it's surprising how dumpy certain things look by comparison), and the backgrounds somehow seeming so much more lurid. I really like how the 2D elements like the missiles, enemy bullets and the HUD have been handled, too - they look as crisp and tidy as something on the DS. These things usually suffer enormously when rendered on modern displays, so it's really great that the whole 'package' has made the transition in one piece, and received the same high level of care.
You might know this stuff already, but just in case, about that alpha beam: the x4 counter gives you a x4 multiplier, so if you're playing for score you ideally want to finish off every boss with one! This makes a lot of fights more nerve-wracking as you hold off on killing them in order to let their beams come out, and have to deal with more of their patterns. (Sometimes it's best to wait for their second alpha beam, as they won't be close enough to death when they do the first one.) One handy thing is that you don't have to hold onto captured enemies all the way to the bosses, since most of them will intermittently send out their own popcorn enemies for you to capture and use against them. This means you can have fun detonating them all over the place! I love using a smaller enemy to blow the armour off a miniboss.
Edit: check out the 'formation bonus' and 'multiplier' notes here for some more scoring tips (some of which you'll have picked up from Burst anyway). They might be covered in much more detail in the Cozmic Revelation manual - haven't had a chance to look at it yet:
https://gamefaqs.gamespot.com/ps/197415-g-darius/faqs/3906