Great concept. This could also be a manic four player game with one key each :D

I managed to get a score of 8037, it was quite fun to play! I enjoy it a lot

very nice and confusing on the first try by changing the key with each tremor. Well done

I really like the idea, but I think the control letters need to be bigger and clearer, and possibly  placed elsewhere  - maybe ahead of you and vertically centred might be an improvement? Music is great :)

Pretty interesting

Got around 4600 although that is mostly due to luck because up/down didn't change until ~4000

Really cool concept and nice music. My highscore is: 3700