Well, you certainly succeeded in your goal of giving the player an unsettling experience! This is an experience.
So there are a couple of problems of which you are well aware so I won't pile onto those. I think I actually managed to enjoy the game much more when I realised the timer was broken: I took my time, enjoyed the art, and sounds and just tried to take it in. I couldn't do that for the first few minutes because I was too stressed! (Which I assume was the intention, in which case, great job. I was mightily uncomfortable).
I was worried about the onboarding, because the console is quite intimidating at first glance, however once I had read through the manual and figured out what I was needing to do; it's a fairly simple loop. My primary strategy was to check the oscilloscope first and foremost and compare to the manual. I suspect some players might read first and not engage with that; I think it's nice that there is both visual and written information that informs the players decision making.
For what it's worth, I'm usually somewhat apprehensive about having to read a manual to play a game, but it worked here; both thematically in the sense of being a console operator and logistically it felt appropriate to open the manual and check the encounter table to verify what I needed to to. I do think some initial, non-manual onboarding would help too.
I've already mentioned that the art and sound is great in its job of creating a really unsettling experience. It's a shame that perhaps you bit off more than you can chew, but paradoxically I think I enjoyed the game much more because of it. Thank you.