Looks very neat! I played the demo on winUAE, my Amiga 500 is in my family home :) A few suggestions.
I don't know in which state is the title screen, but that planet in the background makes logo a bit less readable.
In the very beginning, you can just fly straight and shoot through the enemies. So, either enemies should have some unpredictable movement, or maybe some of them should not be destroyed by one hit. That way the player would be forced to move around.
And I've noticed one glitch. I entered the spaceship, and when I died, it re-spawned me just in front of other obstacle so it crashed instantly after re-spawn without any chance to avoid the obstacle.
Other than that, I am more than happy to review a demo for Amiga 500 in 2020 :) I'll surely play it some more.
Keep on the good work!