I feel your game and only like 2 others (Robocop 2 & Pang) I would have brought if I was a GX owner. The rest are a bit meh for me.
Showcases what Amstrad hardware can really do when used. This is the type of game the GX should have had and not Tintin goes to the Moon. Wonderful use of colours. This is worth £25 in 1989 terms and not 1/2 of those GX games.