Thank you for playing the game and for your great feedback!
The outright killing of the host as mostly put in as a safety feature, as the big guy can't jump, and Ronin (with the sword) can't jump across the bridge, so we didn't want the player to be stuck in a host that couldn't get past certain level areas. Also there is one minor drawback, when inside a host your orb health slowly refills, if you kill the host it starts going down again.
Thanks for pointing out the "continue until all enemies are dead" part. We planned to end the game there with a small credits scene and a conclusion, however we ran out of time. I will update the description to make note of this.
Thanks again, much appreciated.