Anyone remember Behind the Iron Gate? Surely it counts, it *was* a FPS, albeit an early one in '95, and it ran on the humble A500 too. You can get yourself an ADF from here, it seems:
AP53 DisksDon't expect huge layers of prettiness - blue bad guys on blue floors with blue walls fading into the blue distance, if i remember correctly :-) Didn't stop us from playing the demo to death, though... I only had a 500 at that time.
- tomfin