Nice concept. A little warning, you screen does not adapt to all screen. I have a 16/10 monitor, where the letter were cropped. I think you could choose other keys to adapt to the vertical structure (like 1/Q/A/Z), and use keyboard layout (not qwerty keys).
Other than that, it was fun to play for a bit. It could be cool to see the titanic go down as you are making mistake.