I think this right here is an excellent example of atonality done right. Interestingly, not only is it written with that "creepy" vibe in mind, but the colors you achieved are beautiful, in a velvety, "morbid" sort of way. This is one of those pieces that benefits from being played on the kind of piano you performed on, since it kind of has that slightly honky-tonk piano chorus effect going on. The colors "pop" and become more "flavorful", for lack of a better term. The other performance is also good, but using a "cleaner" piano kind of misses that character. I also think it's neat you incorporated a very clear minor 6th chord both near the beginning of the piece and later on. It contrasts well with the spikier sections of the piece.
The near-literal knife stab is a nice touch.
It's really cool you managed to make something that's both atonal, but is also still musically appealing and engaging to listen to. Thanks for sharing, and kudos!