Wow, seeing an on-rails shooter entry was a pleasant surprise! This type of game really doesn't get enough love, so this is a very welcome change of pace.
That said, while the visuals and music are cool, and do a good job of creating an earie atmosphere, the game feels really unfinished. You don't have health, ammo, there's only one type of enemy that doesn't even attack you... I understand that it's a demo, but those are pretty basic features which even a demo should have.
Also, I have no idea how the game relates to the theme of the jam. What "anomalous entity" are we encountering? The glowing, red cube from the intro?
Still, it's competently put together and has an intriguing premise, while representing an under-appreciated genre of games. That has to count for something.