Bought this for my CPC on tape March 1991. Don't think I ever got off level 2. Ironically I may as well have just had the free level 1 demo that Amstrad Action gave away a few months later!
http://www.youtube.com/watch?v=sx4jJlsz7mo
Supposedly coded in just two weeks, as the video reveals it did take longer than that but was still a very rushed game.
Another great video, thanks!
Always interesting to see the contrast between the CPC version and other formats.