There is one realy big issue with this game = Level Design
For example the chains (i guess thats what those were supposed to be) they could very well have been a background object from there looks.
Another Example is that you cant realy make out the dangers sometimes.
If you want to make a time attack game like this you should make clear when and where there are going to be dangers.
Right now it feels a bit like a forced i wanna be the guy (or whatever) speedrun so if you wanted to achieve this : great job... otherwise think about level design.
I can try and give you some tips if you want me to (PM).
Sorry for my bad english by the way (puctuation n stuff :P)