Stickman Flow

+if this is too hard, - if I'm too noob

Same-style layout: Try to keep the graphics the same, don't variate in element design every level, makes it hard to focus on the actual game. Also, try make a clear difference between background (faded) and actual interaction objects. I jumped on a platform only to notice it wasn't a platform (space tower level 3?). Same speed setting when walking left and right: there's a difference now which makes level 6 kinda annoying.
Have a minimum height (or check on left right key press) considering the wall hanging: right now there isnt which makes jumping through small openings (Level 6) really difficult.
Again, this is a promising beta, but there is still some work left to make it appeal to the big crowd. One last note to end with, but have you thought of the 'original idea'? What makes this platformer different from, say, Fancypants or Mario (can also be storywise).

I would describe this as a very promising beta. Here are some pointers;
air control: its hard to properly control your unit while in air, while this gives some realistic hint, for gameplay issues it can be highly annoying to properly manouver around spikes. Try to get this on a solid speed.
Jump: every now and then it feels like me pressing up wasn't registered. Could you look into this?
WSAD, you know what I mean.
Actual object interaction: Right now I go through spikes and outside of the screen, I'd love to see me actually dying on spikes.

wasd

Good!