Nice platformer, what I like the best is this eerie and uncanny mood in first level thanks to sprites and music, and also this liitle thing in third level when we can press the button on the floor and knight falls to his death. Fun little feature that made me chuckle. ;] Good job.

The sprites look great, and I liked the idea behind the game.
It took me a bit to get used to the pause before each jump, but it lead to some fun challenges where I had to time my next jump while avoiding a guard.

I had some issues with the pressure plates/buttons, which actually lead to an entertaining (probably unintended) playthrough. Sometimes the boxes don't trigger the buttons, which forced me to restart the last level a few times.
I was able to get unstuck, though, by wall jumping! If you touch any surface between jumps (even vertical walls), you can jump again, even in mid-air. Figuring out a rhythm to clear big walls or long jumps was a fun mini-game, though totally breaks a bunch of your later puzzles. That wasn't a negative for me though - fun bugs are the best bugs :D

Overall, good job all :)

The mechanics could use some more work, but I really like the mood and character design.