An Amiga version would be extremely cool but unfortunately the engine I'm using, GZDoom, isn't available on the Amiga. So it can't happen unless someone ports it, and I'm nowhere near a talented enough programmer to do this myself, if it is even possible. There is an old version of the original ZDoom from 1999 for the Amiga but it is missing A LOT of features and wouldn't be able to reproduce AB3D to a satisfactory degree. Sorry!
Currently you need a mostly up-to-date GZDoom to run it. It uses some features that are fairly recent. Theoretically there could be a version of Osiris that works on an older version of the engine, but depending on how far back you want to go, it could be a lot of work and could have features cut out. I don't really have any interest in doing that myself I'm afraid!