Oh I thought these were going to be ports of the PS2 Sega Ages series.
The PS2 Gain Ground remake was a bit flawed (e.g. the 3D camera angle making it difficult to judge whether you will get hit or not by enemy bullets and vice versa) but nevertheless, an interesting interpretation of the original and with a graphical overhaul. I was planning on doing a video walkthrough of it to upload to YouTube but it's a tough-as-nails game so I gave up that idea. Also, the soundtrack was composed/arranged by my favourite composer
(see signature) so that's why I ended up trying that game in the first place.
As far as Phantasy Star is concerned, I'm content with the PS2 "Complete Collection" (Sega Ages Vol. 32).