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realised my emulator was running slightly faster than realtime !! so that's why it ran slightly slower on real ZX81, anyway I just rebuilt with reduced delay loop so runs faster, whilest hopefully still being playable

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I need to revisit this and add things like extra levels with different landscape,. possibly into a cave as well. More different enemies, different score for different enemies - multi rate enemies would be better, and one that track 

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updated with extra features:

1) you now get a new life at every 100 scored

2) text is printed when SAM launch warning at bottom

3) the missile smoke only extends 3 blocks below the missile so is (remotely) possible to dodge it from below. You can still shoot the missile if you're skillful enough :)

4) ground is no longer "shootable"

5) enemys now bigger but less of them (mercy!)

Stay posted for future updates