I liked the idea,
I ran on some problem though. Sometime when i killed enemies, and walked over their death animation, I still took damage.
I found that (and that's one me i only play fast game) that the player was quite slow but fot the game objective it fits quite well forcing you into having to fight instead of running over them. Movement where also a bit floaty such as in the air.
Overall loved the game. Also, I liked that you figured out and cleared issues for the next version.