I appreciate the atmosphere of your game. I only made it to the second screen, but feel like I have some valuable insights.
First of all - and this may be something to do with fonts - on the main menu I didn't see all of the controls, only movement and running. I had to find that jump was 'z' purely by trial.
Secondly I feel like you should spruce up the main menu a bit. Make the title stand out more, make those levitating thingies stand out more, it is initially hard to understand what to do (maybe something to do with my screens brightness settings??)
When I hit 'esc' for the menu in the game it comes up with menu, a blank option and 'ui' which is quit? If I choose any option other than quit, it drops the character down into the main menu again, then starts the first level again.
I'm running the game on a laptop, processor is a Athlon 2 dual core 2ghz (or something similar) with 4gb of ram... It seems to run sluggish, which is why I can't progress in the game. It's frustrating, but not in the sense where I feel the puzzles are challenging, just where I feel like I'm wrestling with sluggish controls or something.
On a minor note, when you enter the second screen, if you hold 'up' right away the body in the spikes will start moving up the screen.
The film grain effect is cool, I was thinking a good effect for your game would be to frame the 'story' text at the beginning of each screen like they did in old movies (i'm too stupid to get the link button to work so here is an example: data.whicdn.com/images/7769830/tumblr_lhgg4002YW1qd6t8yo1_500_thumb.gif )
I like the art style and like the weird face in the background. It would be cool if there were a bit of interaction, maybe have it laugh when you die or find specific situations to make it react. I think that would heighten the game experience somewhat and wouldn't be too difficult.
Anyways - I think I can understand where the game is coming from, all in all good job and thanks for sharing.