Not much time to work on it as I have a sneaking suspicion that getting Space Inavders working on the CoCo3 is pretty low on my employer's priority list.
Fixed the player explosion, UFO explosion and the UFO score when hit.
A number of 'magic numbers' in the disassembly have been fixed, including instances in both code and data. In order to get things working properly I've also had to ensure certain groups of data structures - such as various tables for the UFO - don't span 256-byte boundaries.
Getting closer now to finishing the coding, mainly shields. Then I'll be moving onto optimising and cleaning up (removing old and duplicate code) before debugging and tweaking alignment. The most obvious glitch is hitting an alien just as they're dropping down and not erasing it.
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