This is harrowing. I can very easily imagine this in a sci-fi survival horror game. You effectively created an intense, disturbing atmosphere that's scary even without a game.
The high-pitched noises can be grating after awhile, though. I understand wanting to make the player uncomfortable, but this would probably give me a headache, and make me shut the game off for the wrong reason. Maybe lowering their pitch, or using EQ to soften those high frequencies would help.
I also think I need a second, contrasting track to hear how this correlates to the theme.
Nonetheless, this is super creepy, so great work!