Yes thanks, very good stuff. I don't disagree with your movement choices. But personally, I didn't see or feel if and how the wall was going faster. Remember some times the wall is off screen so we can't immediately see it change speed. But that's indeed the right idea and a good alternative option if you don't want to alter player's movement. Perhaps with music (that speeds up!) the messaging to the player will be clearer. I hope you make a prototype of this game in the future, good luck with it if so.