You nailed it! That sense of paranoia is 100% what we are aiming for.
We definitely design quite a few anomalies to be "blink and you miss it" on purpose. Obvious scares have their place, but the real psychological dread comes from that lingering self-doubt. When you catch a faint twitch in the corner of your screen and have to stop and wonder, "Wait, did that actually move, or are my eyes playing tricks on me?", that tension hits way harder than a regular jumpscare.
Really glad the subtle approach resonated with you!