Really fun concept! took me a while to understand it, but after that, it becomes quite a fun experience. Also, the music loop is very good!

this is really hard... like rubbing your one hand on your stomach in circles and patting on your head with the other one :D

Snake already fits the limitation, and double snake fits it even better. I think it would've fit even better if the snake's bullets could hit the other snake's bullets for keyboard players in order to balance out the fact that keyboard control is far easier.

My critique applies only to keyboard movement. I feel like sometimes game turns off after clicking move button. Beside that the game feels and plays awesome.