Hey anoqmous!
Thanks for checking out Esoterica -- I am glad you enjoyed it! Totally agree with you. An indicator was in the works, but just didn't make it in time for the final build. Going to be one of the first things that is added once the Jam concludes and I start updating the game. I will also be sure to include some sort of progress system so there is a bit better player feedback. At the moment this is just the voice line that power levels on the radio amplifier are increasing, which in turn is supposed to be what's causing these anomalies to leak through and effect the room/cause events to happen (... or is the player just going slowly insane being confined to a room listening to weird stuff all day... O.o).
Thanks again for playing!