Escape should never quit the game immediately. A teleport cooldown indication is missing. Windows-key does not minimize the window. Don't shake the screen on every shot, it loses any impact it's meant to convey and makes it annoying. It's hard to differentiate the bullets. The different pattern variety is nice, although I don't understand how the weapon combinations work as dropping and picking up weapon doesn't change the pattern back.
Patiently waiting for the next DD.