for me, the little guy kept getting stuck in the first tunnel area (so that he couldn't move at all) and I couldn't proceed with the game. the art style looked great and the two player concept is very original. congrats on the submission!
sure, here's a screenshot: 
he would get wedged into that tunnel and couldn't move
I thought that was the way he was supposed to go at first, and I didn't realize that he needed an upgrade to get down there. I was eventually able to figure it out, and could play the whole game. it was really fun! this one needs a lot more attention