For best results, should this be installed on an AGA machine or can any Amiga be used?
You can use any Amiga you want, but
for best results you should use an AGA Amiga because AGA Amigas have more bandwidth, which allows blitting to proceed faster.
Remember it was written in AMOS so its not some sort of speed demon. Running it on an AGA machine helps it a little. Having a fast CPU helps some too.
Edit:
Doggone it! I just realized... due to the way it is
probably coded... it probably makes no difference whatsoever if you use an ECS or AGA Amiga.
It probably opens a PURE ECS screen using 32-bit alignment which means you won't get the speed boost on AGA. AGA gets its speed boost from 64-bit alignment.