That was a longer game than I expected, super polished platformer. Nice concept and level design, especially I really liked the segment of finding the right spike to die, clever use of checkpoints and glitched blocks. Also graphics for background and visual effects when glitched were satisfying to look at.
The bossfight had a lot of great effects too, but not a big fan of gameplay since the player can't hit the boss until it uses the specific pattern, making it luck-based. It wasn't really a big problem since player had a lot of health, but I would suggest making more deal chances for the boss.
Hope this gets more attention, great job :D