A nice evolution of an old formula. Excellent basic design, and pacing.
Really enjoyed it, but not sure if it has longevity.
My feelings and experience of playing the game:
Being frustrated by how my ships were getting destroyed before realizing that there are different ship types.
Being frustrated by losing all my ships to an asteroid field
Feeling good about figuring out all the ship types
Being frustrated by the alien swarm thing.
Being underwhelmed by the defense station
The nukes feel really nice.
Losing to the destroyer because I didn't understand how it worked, and I played a fast offense and had no missiles to defend against the initial meteor burst.
Doing a lot of busywork, moving ships around.
Winning by accumulating 1000 ships on the central planet before defeating the swarm.
Suggestions:
Make asteroids less punishing, more more explicitly dangerous.
Let people choose if a planet builds a defense station or missile base. Alternatively, certain planets are "defense station planets" and certain planets are "missile base planets"
The final boss appearing even if the swarm is not eliminated, and absorbing the remaining swarm. The timing can be dynamic/