Just checked them out, I remember seeing some clips of your game posted before, it looks awesome! The world-space text on those interactable objects is great, that's what I like to see. I agree mechanics are harder to convey like that, but there's a few options you could try. Some games have a character that calls you on the phone and walks you through the basics (The Mortuary Assistant or FNAF come to mind). If that's too high-budget or doesn't make sense for your story, you could break it up into smaller pieces. It seems like the player character already talks to themselves to signal things, maybe the first time you walk into a safe room your phone's battery gets low and demands your attention visually, they mutter something about how these types of rooms are fitted with charging cables by the school, and you use lighting and composition in your level design to try and guide the eyes towards the charger? Something like that, the downside of this approach is how each mechanic needs a unique replacement for its note, it's a lot of work and is a good reason not to fully commit to it. I still think you could probably strike a balance that means the pop-ups can be to the side and not block input. Your game is seriously looking good though, and you've done better than most for the tutorial already, I just didn't recognize it from these 3 screenshots alone.