Came back to try and beat the last levels only to discover secret ones, so I guess I'll be coming back to this yet again in a couple days hahaha. I'm loving this honestly, it's so intriguing and unique. Really hoping I didn't miss anything on the level with the valves, this game is triggering the completionist in me, I just need to get everything. It reminds me ever so slightly of FNAF in the sense that you need to react very quickly to the threats or you're dead, I really like that, it makes it very stressful and nerve wracking. Keep up the good work!
The pipes you unlocked were actually for meeting other conditions separate from the valve puzzle. The valves open a section of the map that I don't think you saw based on the video. Although as it stands there's nothing that tells you it was missed, so I'll look to add something to the next update.
And thanks for playing!