This game feels so much like Qix that I almost feel like I'm playing an unreleased spin-off of it, hidden in the backroom of Taito's warehouse. The game itself works fine, but I have a couple complaints that I would like to see addressed.
The game simply does not want to be played; I'm using the latest version of Chrome browser, but the three times I tried to play it, it crashed the tab during gameplay. I don't know what causes this, but it might be worth looking into. The other two complaints are minor; the Drawgun logo and ship explosion graphics look a bit too advanced for 1983-ish standards, and break my immersion a bit. You spent so much effort evoking the Qix feeling that I feel you may want to change these graphics. Also, the title screen's instructions are cut off at the sides.
Overall, good work, and thank you for creating this game.