UPDATE 08/11/20:
A couple of months ago I was contacted by the game's original designer, Alex Freeman, who had come across my remake
and kindly decided to send me the game's original source code and assets. Using these, I've created a direct port of the
original game.
It's available to play here: https://www.jenniferedwards.co.uk/unitygames/BigAlPort/
It's great to see the game in its original form!