Great game, I had fun playing with it! :)
The camera felt a little too close for me. Also, when attacking you only attack in the right direction if you hold down the mouse button, if you just click and release it, the character turns back into moving direction and shoots that way. I could not attack the boss with my minions alive and they did not attack the boss either. But it is a nice little touch that the hp of the minions decrease over time. I would have liked if my minions could aggro/taunt the enemies off of me.
Nice game overall, well done! :)