The counter feature that was added is EXTREMELY nice. I love it.
One thing I would really love is if there was an option to take control of a character in gallery mode the way you would in a game and possibly outfit them with any weapon you want. Would allow me to freely control and create fun situations by myself that wouldn't be possible in the main game. The gallery is so close to being the best thing ever except that you can't use your characters there.
Otherwise, a less desired feature would be to completely randomize all enemies in all rooms, so you could get like a spider or heck, one of the succubi in like... ROOM ONE, lmao. A chaos random mode