I liked it, no gripes!
People really aren't getting it are they?
The invincibility makes combat easier, assuming you know how to use it and have more than 3 brain cells. You hit them the entire room away from you, and move. Also, I rarely got hit so I never had a problem getting knocked around. I would suggest adding a system that made you stronger over time or can switch out weapons, perhaps based on length. (short sword does big damage, medium length does medium damage, longsword does less damage)