Oh I am sorry - but thanks for playing and trying. We ran out of time and were overscoped with this one. There is really no guidance on what to do except the text in the menu & the game is very hard ^^
You can interact with "F" and then use A/D for most devices like the computer to get a small time boost. The intended experience is to first learn the level and find all the devices and then to find the optimal route but again I agree - there is no guidance on where to go and what to interact with.
Eventually we want to push a small update to fix all these UX issues.