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CNGSoft has released an updated version on his personal site that makes several adjustments to the behaviour of the enemies:

http://cngsoft.no-ip.org/alloybox.htm

Surely this is still a bug that would need fixing, though? There isn't enough space on the original game disc to store a saved game (it requires 11KB and there's only 10KB free), but the interpreter should at least report this and return to the adventure if it fails to save.

I can confirm that the scrolling is headache-inducing on my real CPC6128 (with a type 1 CRTC) as well.

I've tested it on my real CPC6128 and I have the same problem. I have examined the code and there is a bug in the keyboard scanning routine. The same bug is also present in one of Leosoft's other games, Druid and Droid.