Very nice work, my favourite from this RGCD. Reminds me a bit of the Raiden arcade game. More contrast between bullets and background might be nice in some places.

At first, I wasn't sure what was going on, but soon realized that I was confused by the fact that my ship's laser fire wasn't appearing on screen every time.   But, now that I figured that out, the game-play makes much more sense.

The only issue I have with the game is the colourful backgrounds.  They are done really well, but I find that the bright colours and sharp focus makes it difficult for me to target the enemies at times.  Also, with other space shooters, the rule of thumb is not to collide with background objects.  So, it takes some time to adjust and ignore the backgrounds, in this case.

Overall, nicely done.