Man, just a quick PSA if this is even the thread.
I've played through Ion Fury on PC with a controller three times now. Works beautifully through Steam, controls feel great, custom button mapping and all.
I love the game so I grabbed it on PS5 as well when I saw it on sale for $4.99.
In short, this port sucks imo. First of all, the game looks weird. There's something off with the brightness. The only option is to turn down Gamma and it doesn't help.
The real issue are the controls. Only two preset options and no way to adjust the shitty default aim accel. The main issue is that there is no way to remap the weapon toggle. On PC, I mapped weapon down to L1 and weapon up to R1 which works really well for me. On console it's mapped to up and down on the d-pad. The game requires constant weapon switching, and quickly.
I just wanted to get it for the convenience and to support a great game but was unpleasantly surprised.