Not bad but a bit too simple...
The concept reminds me of the classic copter game. It was an alright game but like i said it was a bit too simple.
The graphics werent bad but because of the simplicity of the game i was hoping for some sort of explosion when you hit the asteroids. There was also no explosion or ending animation when you hit an asteroid which made the game lack a bit in the graphics side. I do think that the graphics suited the rest of the game though and the cartoony kinda graphics work well.
This game was also a bit too fast paced, The asteroids once shot at turned into two seperate rocks, but they were both still hurtling towards the rocket which i thought made it still difficult to avoid. Maybe too make the game better you could slow the movement of the rocket and asteroids down and maybe make the asteroid pieces float back a little on laser impact.
Overall though, it wasnt that bad a game and it looked decent enough to play.