Yea we made the aim be without a mouse/cursor/crosshair because it got tricky due to the isometric view. Since the character can only shoot horizontal any point that you could click which is higher or lower would have caused the bullets to go into a visually different direction than intended. So instead we quickly made a aim method which tries to simulate a controller right joystick for aim where it just takes the last direction of mouse movement and rotates the player in that direction.
Regarding the Health there is currently no way to heal, that's by design to make it more difficult.