Great idea !
Combining your life and your weapon is not really common !
If I may : I was lost a little bit at the beginning. I didn't know how to survive after the first hit.
But after thinking about it I figure it out the mechanics :P
If you have time post-jam, a little tutorial would do the job perfectly :)
My submission here if you want to take a look : https://itch.io/jam/gmtk-2019/rate/462077
Good job overall :)