Aside from the controls listed on the game page, I found that I could also shoot by holding down the mouse button, in the direction it's pointing. It makes the game a bit easier if not intentional.

I really like that you included VAs in your game, but I found it overpowered by the background music at times. The audio controls only seem to have an on/off button rather than full volume control. (Could be a useful feature.) 

Overall, it's a fun game.