What a great game - this caused me to buy it - it was so good.
Loved the way you could keep your power ups as the game progressed, that was really cool.
One request - would you consider changing it so that any remaining time is added to your score as well ?
Below is my tribute - but - I have also created a ZTG file for this for the ZX Touch complete with your cassette and info card. If you want to add it to your ZIP file - please reach out to me.