Cool idea! I think that the glitch slide mechanic could be improved. Maybe instead of having a cooldown after each use, add a gauge so players could do some combos or whatever.
Glitching through the walls could be encouraged instead of punished, with the addition of this gauge, and only make the character take damage if the gauge runs out when you are inside the wall.
PS: I was having trouble at first because it's not well explained that you lose health by glitching through the walls.