Very cool stuff - I especially like the 3D effect when the player moves from the far side of a screen to another side. As you said yourself though, gameplay needs some work
This is somewhat similar to what code I’d already written for a game (also a spaceship game, but most likely racing rather than shooting). Mind you, yours is way cooler - mine didn’t look quite natural.
So far, I’ve had four ideas for the 4k (Couronne, Left 4 Dead clone, Space game, and a remake of one of my non-4k games) - three of which have already been more or less taken. Ack! I’ll have to be faster next year! :>