I made space the drop button, and use up to rotate right. I think I could get used to having two buttons to rotate, but maybe not without a controller. I don't use down, so I could have made that drop, but it feels more natural to use my other hand.
I agree with this, I made the same mistakes at first but now I can play this and not the original! Could you also consider adding a pause button? Sometimes I need to pause the game.