I liked the old arcade style of the game, though it felt a little slow paced. I also liked how you added the ability to destroy the upgrades. I've never seen that in that type of game before, though it logically makes sense and adds a challenge (and prevents spamming space bar and just shooting everywhere). The red/blue dots kind of blended in with the white dots of the background, but I'm not sure if those could hurt me or not. I was really surprised when I suddenly died upon touching the boss (got too close trying to get an upgrade), but I liked that mechanic, as well.