Here is where I am at so far

https://dl.dropboxusercontent.com/u/25007545/Games/1304/LD/build000/build000.html

I have a lot of the mechanics in place but I have a few more ideas for obstacles/ challenges to add. I am not completely happy with the speed changes but they are alright for now I think. Hopefully I can make some interesting puzzles from this basic mechanic. This build has a few simple ideas then stops.