I really like your style man. It's a lot of fun to watch and I'm sure it was even more fun to draw. As for crits the only thing I can see is iron man's legs, boots and feet don't seem right. They seem a bit too cloth like to belong on IM, that's not really a crit so much as an opinion. The only real crit is that Thor's left arm is missing
I just really dig this style. I'd love to see this done up in a kind of stained glass effect. That would be really cool. Keep up the good work!