While the idea is interesting, there's a lot that isn't explained in-game, like the displacement/replacement mechanic or even how to play. I spent a fair while trying to figure out the keys to move. The idea of randomised stages is a neat one and I liked that aspect a lot. If there'd been even more of that it would have been cool, but for a prototype it worked out well to show what your idea was and how it worked, so good job on that.
The graphics and sound are neat-enough, though there's some pretty harsh pixel clashing going on at times. One thing that annoyed me was how big the screen was and how resizing it didn't help with the intro scene. A lot of it was cut off even after I readjusted the window size meaning I missed a fair chunk of the 'story'.
Overall, it's a good promo.