Pretty good but...
it could use some improvements, I find it a little bit to easy especially the bosses. The level design gets really repetitive and drag out for way longer than they need to. The controls were responsive for the most part, but sometimes I had a bit of a problem getting the ship to go the way I wanted it when I needed it to.
There also didn't seem to be any penalty for death, maybe more of a reward for people who don't care about the score.