Nicely atmospheric. Good job for a jam game. I do have a suggestion to make it a little better after the spoiler dots:
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It's pretty difficult to write down the morse code (since I need my eyes to write it down, and also to watch). With sound, it would be much easier, as I could use my eyes and ears at the same time.
In fact, something like that could help put in more content. For instance, you could have a volume knob somewhere in the game that enables a sound, or hide the flashing dot behind a panel that has to be opened first and the components in the panel also have a small buzz along with the flashing. Maybe even have to find a tool to open the panel with. And with little additions like that, you have more content in your game.