Hi SaNchez,
Thank you for taking the time to reply to my comment, I will set the game up over the weekend and get some screen shots of the areas that I found extremely difficult. As an explanation to "pixel perfect" I mean that you must follow a specific sequence of actions in time to get through the screen, it is like "Manic Miner" when you must jump from a specific point to be able to get through the cavern.
I played Aliens Neoplasma (128K) all the way through and enjoyed it so much that I bought the ZX Next version and then played that all the way through. Although I have the ZX Next version Aliens Neoplasma 2 I found playing the 128K version so frustrating I don't want to play it.
I hope to send you some screen shots next week.