The presentation artwork, music, sounds were all quite satisfying. The concept for the game is also very cool.
As other commenters have mentioned, I found the controls quite tricky to get the hang of. I found pressing Q to get a new knife just felt like busy work that made my hand tired (of course I want another knife after I've thrown one!) I found coordinating the E press with mouse movement to be exceedingly difficult, even after 6 or 7 rooms I didn't feel like I was getting much better at it and it stopped feeling like my skill was helping me. At some point I gave up on playing skillfully and started randomly flinging. Some visual incentive not to waste knives, such as a score with penalty for misses might help with that urge to just fling randomly.