This was really cool! The idea is really creative, although I kinda wish it was expanded on a bit more (like, maybe you could change the height/position of your head?). The rooms were a bit dark (and I made the mistake of playing the webgl version), but I feel like this could be expanded upon in a neat way. The controls took a bit to get used to, but I got there in the end.
My one major complaint is around visuals - primarily that the enemies looked a bit too similar and their shields melded into the darkness a bit too much. It was hard to make them out in some areas due to a combination of lighting and dark materials on the models, so you basically had no clue where they were (which was more frustrating than scary honestly).
I also like it could've used a bit more variety in terms of enemies - maybe having some that followed your head instead of your body would be neat?