Thanks for playing it!
I did include control explanation on the floor, although given the feedback I have been getting I see that it wasn't obvious enough as it's missed. I was going for trying to explain the mechanics through gameplay (less is more) with really minimal instructions to let the player feel things out.
As for one-hit kills and dumped right in - I completely agree, those 2 things where left unfinished due to time constraints (the player taking damage was the last thing I got working before I ran out of time...) In retrospect, I would have spent less time on some of the other things and gotten that working earlier so I had more time on polish and balance.