I really enjoyed this game! At first, I didn't quite get the hang of it; I reached the final planet and escaped without defeating the last ship. But the second time around, I managed to build an invincible fleet and beat the game.
The art style, balance, uniqueness, and Game Boy aesthetic are all top-notch. While the fit with the theme seems a bit debatable to me, that doesn't detract from the quality of the game itself. I hope you'll add a soundtrack to the game in the future.