I loved the level design! The controls were frustrating at times, forcing me to repeat the same steps over and over again after I already knew what had to be done. And when I threw the knife over the guard's head I gave a huge facepalm.
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Things like using an item not wanting to (a big deal since that is the main distinguisher of the game), slipping off from edges (especially when trying to jump on top of boxes), the fast reaction time required to throw the knife, and the way the knife goes in an arc above the guards. The key for using an item also should be changed, it could use a different finger than the movement.