Hey, first of all, I actually had a bit of fun playing this.
I wouldn't dwell too much on the cons stated in earlier responses. I'll focus more on the gameplay:
1. The wall climb is buggy. When wall climbing sometimes, the player get slows and start flipping back and forth like it's looping through wall detection over and over again. This mostly happens when you are close to the top edge of the wall.
2. The upward attack sometimes makes double hit, first hit on the swing up and second hit on the swing down. Not sure if it's intended this way.
3. The wall jump is way too restricting. When the player jumps off the wall, it takes too long to take control of the player. This makes it impossible to wall jump vertically on one side of the wall to climb.
4. I'm not really sure how the resource to heal refills.
It would also be nice to add controller support.