Inti Creates, developer of Gal*Gun 2, recently spoke to Dengeki about the Switch version of the game. Senior designer Masanori Ito talked about how close the game would be to the Playstation 4 version, saying that “while the Switch has handheld mode and different specs from the PS4, the game contents will be the same and I believe the graphical quality will be close. … Definitely, the gap is not that big.”
Ito also commented about when the team decided to do a version for the Nintendo Switch. Ito confirmed that the team “decided on the Switch version mid-development. I thought, ‘This is going to mean more work,’ but the Switch is portable. It’s great for players who want to play it in transit or outside, and the shoot ’em up style of the game is not bad for portability.”
If the Switch released at that time, you can’t fault them. If it was after that point, they weren’t ready and it’ll show.
Considering the art style, it shouldn’t be too hard to get the graphical quality on Switch to match the PS4… Least while docked. Now if the game is doing 1080 on PS4, then I’m not so sure.