Really fun! I love that the combat/economy balance was simplified down to a single slider, it made the concept really approachable and simple. The hold option was a really good idea too. Great work on the audio as well.
I would have liked to see a little more depth in the gameplay. Maybe the ships can also gather resources. That way the player has to decide whether to focus on combat or economy. Another simple addition could be adding more enemy outposts in the map. Then the player has to decide whether to keep ships at home for defense or send them out to an enemy to attack.
A simple and fun game overall, I really enjoyed it. Great work!