Ok, it worked with google chrome (previously trying on firefox). For the feedback:
I really like the cooperation bits, for example there was this big green box which was hard to move for the big guy alone but as I pushed with both characters simultanously it went smoothly (a small detail but good design). The change of perspective for each level is great too.
I have one suggestion for a change in physics: when the character jumps in mid air you don't reset it's velocity which means that if I were falling for some time my jump would be tiny, but if I hit the jump button immediately after I get the pinky stuff my jump would be much bigger. With a reset (at least to some extent) before each jump their height would be more predictable.