What this made me wonder about was the possability of getting something like this going on a classic Amiga, cracked out 060 or less. Oddly enoguh though, the Free in the Dark sources seem to be missing from the Sourceforge site.
Alone in the Dark runs perfectly on a 040/25 with Shapeshifter+AGA (I didn't test it with anything less but on PC it ran fine with a 286/16Mhz, so no reasons for it to be slow). A 030 with MMU should run it smoothly.