Good Job Keep It Up
The Game idea is really good but make use of the ctrl and shift button instead of the up button as jump, the gets irritating, and the first jump on the 3rd level is near impossible it takes several attempts and very very very good timing to get across.
The stakes on the ground aren't a challenge they're annoying, and the invincibility time after getting hit should be slightly longer. I think instead of turning transparent the character should fly back or else you'll just repeatedly take damage. In Level 6 I think those flashing platform should be visible slightly longer because again it takes lots of timing to get it right.
There should also be help signs around the place other wise you don't know what the hell the other guy is doing there.
Overall the gameplay is o...k the music is engaging you just have to start working on the details.
A fine job Scorp!