Posting this here as it might be of interest.
Last summer there was a discussion on a C64-forum about Elon Musk (known for Tesla and SpaceX) having a VIC-20 growing up. In a book by Ashlee Vance about Elon Musk there's a scan from the magazine "PC and Office Technology" of a game listing. When I and others examined the code however we figured out that the listing must be for the Spectravideo 318/328 (my first computer when growing up).
I think so because the program starts with CLICKOFF which MSX BASIC doesn't have. There's also a Spectravideo-logo on the scanned page. As some of you know, the SCREEN layout are also a bit different with regards to Spectravideo 318/328 vs MSX. This is how it looks:
Anyway, the scan is here along with notes how to run the transcribed listing in OpenMSX: https://archive.org/details/blastar-elon-musk-spectravideo
The transcribed listing is here: https://ia903005.us.archive.org/4/items/blastar-elon-musk-sp...
Did you also scan and transcribe it from the book or did you use my upload? The game itself is not very polished in my opinion, it seems that if you don't do anything (f.ex. when struggling to figure out joystick configurations as the game starts) and the first "status beam" is sent, then the game goes into a kind of loop where you loose all your lives. Either its a transcription error (which is not entirely impossible as it's quite hard to read some of the code) or the game was not tested much. Either way it's very cool to be able to replay it.