Thanks for playing! I had bigger plans for speed mode, but time limits got in the way. What is does right now is increase enemy movement speed by 20% and increase the biscuit value of everything by +1. Collecting biscuits and bouncing on enemies gives 2 each and the "Risk it" option gives 6 instead of 5.
I had planned to make a variety of these and offer a handful to the player at the start of each level as different ways to incentivize increasing risk for more biscuits.