This is a fantastic game, very fun and very polished! I enjoyed the first GBAX version and was looking forward to an update, and what a nice one it is. Thanks a lot U_D and rok!
The bullets are a nice addition, but may I suggest assigning them to A instead of Y? It's difficult to press Y while still keeping X pressed.
Seeing the ship's name in the right panel, do you plan to include different ships to choose from?