This was a conversion of the Amiga original to PC on behalf of Ocean Software. We did meet with the original development team just the once, and they confirmed the odd animation of the main character was entirely intentional and ‘funny’, so now we know.
My Contribution
I developed the PC version of Alien Breed in 8086 machine code, from scratch without access to the original Amiga source. So my good friend Stuart Hodgkinson (Merlin the happy pig) played the original game end-to-end making notes of every aspect of the gameplay, so I could replicate it in the PC recreation.