Thanks for you feedback.
In term of difficulty balance yes we sure have to work on that ^^. we didn't think about the health bar placement being closer to the "boss" than the player but now that you mention it, it's sure could be confusing.
I don't really get what you mean with the mouse though normally the projectile don't go on your cursor position but follow the scrolling so it's harder to hit the boss that is following but easier for the rock that are in your way.
But thanks for you comment, appreciate.