So, only basic impressions so far, keep in mind I have GGDP but haven't gotten around to playing it yet.
This isn't a VR version of GGDP, there's no story in sight.
You start in a classroom hub, where there's not much to do. You can use devil sweeper with the left controller to pull stuff around the room, books and bags, but not much else with it. The right controller is the main gun, but you can switch it to a Pony smartphone that can take pictures (they get saved to a folder in your My Documents) and check the pictures you've taken. The phone also slows down time while it's out.
The games menu gives you the options to select a stage to play (starts with stage 1, they get added as you go, no idea how many), invite girls or teachers to the classroom or your bedroom (they just talk, you can poke them with the main gun, blast the sweeper and have them hold their skirt down, or take pictures of them with the camera), an option to change clothes the characters wear (separate categories for different year groups, not many clothes options though) and the actual games options (changing render scale, setting eye height (only from 140-175cm though), turning on shadows, switching the guns, and probably one or two things I don't remember.
The actual gameplay, I presume is like GGDP; shoot girls, shoot the little devils, move to the next part of the stage (with the occasional option). I didn't know about weak points or sucking in the devils when I played the first stage, so I was shooting everything directly, something that caused my trigger finger to ache a few times, but I figured that out for stage 2 and had no problems. Aiming was easy and accurate, felt nice, lots of fun.
I'd say if they intend to go the next step and add VR support to their next game (with a full story, not just a stage-based spinoff) then it should work pretty well as another option on how to play.
I'll probably add more impressions when I get to play more, but I'm definitely liking it so far. Might even bump GGDP up in my 'to play' list.
Yes, I have an achievement for taking an upskirt photo. Okay, 2.