Overall very good game. I like the idea of using the keyboard to choose the path for the enemies. Unfortunatelly I had to use the mouse, because of my QWERTZ keyboard, but I like it very much that you put the option for the mouse into it. Clever game design ;)
The graphics and audio are really nice. It's now the second game in a game jam that I see using this tube tv shader. I know that you can create some of the effect with the post processing package in Unity, but I don't know how to get the line effect. Is this just a transparent overlay? Do you have any tutorial for this effect?
Unfortunately, I have to cut some points for the theme. I read the theme description on your game page, but that is not enough. Sorry.
I think you can really build up on your game idea for a full fledged game, but I'm not sure if you should stick to the keyboard level layout. It's a nice idea, but it is also resctricting you with the level design.