I think you could have informed that the player needs to refresh the page to be able to switch between mouse/keys controls so people won't think either of them is broken.
I remember playing the game on another computer some years ago. The game ran slower and there was actually a delay between the obstacles so the game was much easier than now.
I got to 131 and then a wall of dots fell on me and I got trapped under it and between two walls of bouncing balls. It gave me the text:
"life can be cruel sometimes"
Indeed.