Ha! I don't see how you could really expand this idea much further, but as a novelty game it's very cute, fun, and well put together! A few glitches, like buttons spawning under me or offscreen, but with such short rounds I never really cared.
Actually... after thinking about it for a moment, I suppose you could actually turn it into a fun tool for learning morse code! Like low stakes: ppl play your game, learn morse code, and show off at parties, et cetera! Especially with a diversified vocabulary; like the buttons could be colours one round, food the next round, animals after that. I dunno, just a thought! Great work regardless!