Good job :) Overall I like the design, though it might turn out to be a bit too big.
Important question - how will speed ups affect jumps? Did you take this into consideration when designing? And following on that - when will the player loose these power ups? On acid respawn or full respawn?
Regarding the design document itself - I like the legends, though you could definitely work on the layout of the page. As it stands you have a lot of white space left while most of the text is so small its unreadable (This might've worked better on paper, but then that is a waste of paper to go for font size readable at A2 while not properly using the space of the page).