Nice attempt, Adrian.
As for critique - I'd say the stars lack some colour, there is a gap and total exposure time is too short.
When I made star trails from my 15 seconds time lapse shots the exposure settings were 15 seconds at ISO 1600 or 3200 and f/2.8, so yours are under-exposed for a dark sky location (different story in the suburbs). I also batch post-process the images with curves to bring stars out and suppress the Milky Way a little as it looks smeared in the start trails before adding them in Startrails program.
For star trails alone you might be better off with 2 or even 4 minute long exposures and stop the lens down accordingly.
Keep trying
Alex