Apparently not many games used Akiko, so it is not a big problem. Shame though, it is supposed to be quite good
Microcosm is the only game that used the Akiko chip. I've heard people say that Wing Commander (CD32 edition) used the Akiko chip too, but I've never been able to verify it (I've only ever heard it mentioned in recent forums, I never read it in an Amiga magazine at the time).
Don't forget, the Akiko chip isn't just about chunky to planar conversions. It also handles some functions of the twin-speed CD-ROM drive.