It's not bad, the idea of preparing your ship mid-flight is very interesting and makes the game much better. The side-scrolling fighter part of the game was okay. It wasn't very interesting to me, but I don't enjoy side-scrollers that much. The music isn't great, it felt annoying and repetitive. This game has the potential to be very, very good. With that said, I had 2 main issues with the game.
1. The controls. I was using a touchpad on a laptop, so I couldn't easily use one of the cannons.
2. The difficulty of the game. This might be because of the previous issue, but I died twice before I could beat the first level.
Anyways, good work on the game! I encourage you to keep working on it.