Cool game, great graphics, nice sfx, banging tunes (very important). Played through the demo. Lots of different types of enemies already which all look good. Don't have much constructive so say really, keep doing your thing. Biggest complaint I have is the ~1s delay in the menu when pressing something. Also some score counter is needed but I'm sure you have that planned.
Maybe mouse movement could be nice, when playing with keyboard for more precise movement.
