A lot of games used more than 32/64 colours using the copper too though. E.g. things like background fades. Interestingly quite a few of the games with the most colours did not use the 5 bitplane 32 colour mode or the 64 bitplane Extra HalfBrite mode, but a combination of "dirty tricks" with sprites + copper.

E.g. Shadow of the Beast used 120+ colours, but used dual playfields, which gives only 8 colours per playfield without anything else. But then it overlays sprites, and uses the copper to change palette repeatedly:

https://codetapper.com/amiga/sprite-tricks/shadow-of-the-bea...