I appear to be unable to face left to fire unless I am actively hovering over the left arrow button. Holding down the keyboard input for "move_left" moves the player left but does not face the player left.
I would venture to say this is meant to be a mobile game first. Too hard to play on PC without the ability to control both direction and firing at the same time (as I can only control one with my mouse at a time).
Otherwise, seems fun! I like the theme and the design!