Very interesting idea though I would love to see more variety in the challenge, maybe different kinds of ships or added items? Visually it would be a lot more appealing to play if movement were smoother too, I understand that's intentional to mimic space invaders but given most of the play time is watching the AI move it could be nicer to watch.
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There was the idea of making more types of ships, like with double life, but I didn’t have time to think about it in more details. The initial animation and a few bugfixes took away from me the last few hours.
The speed of the game is intentional, it recalls the original game and it helps to study new tactics (I thought). Your observation is not wrong anyway, perhaps not smoother but a little more speed wouldn’t be bad.
Thanks for your feedback and time.