The good
The game achieves what it says about difficulty, meteors are a great way of spicing up things. The lasers look beatiful and catchy.
Improvements
The alien ships need a variety
The gun from the players ship should have a sound. The players ship physics should follow newtons first law of motion in a vacuum of space. There should be collectibles like new guns that change the way the ship looks.
There should also be a life system to give three chances in one level as the player progresses, players should also be reawarded for shooting many ships with life, guns and othet space stuff.
Boss levels should be added
There should be different ships to be unlocked as player progresses.