Or are the screens generally too small for games like Touhou or Mushihimesama that require carefully weaving through a hitbox that is only a few pixels wide through ribbons of projectiles in slow motion? Those games were designed to be played on home computers or on a normal sized screen at the arcade.
A recent mobile phone is more legible and has an actual backlight + OLED. GBA games have become early unplayable for me now on their original hardware.
I also placed a Joycon style control on top of the screen and measured the screen size of thr upcoming Retroid Nova handheld for comparison, which is 4.5 inches diagonal. But I have doubts that I personally would want to play the type of JRPGs on it designed for old consoles that I could more comfortably play and read on my existing 6 inch long phone.
I am thinking of buying one for my Retroid handheld, but would be even more useful if I could sometimes use it for a phone & Razer Kishi game controller too.
Does it work for Backbone controllers too?