I appreciate your attempts at doing some real animation (fbf), but it's not really difficult to do at all unless there's some subject, or you are in some way trying to replicate something real. The only thing here that i saw that wasn't just random meaningless movement was the explosions. They weren't too bad, but definately need to be worked on.
Altogether, you're on the right track with what you're doing, but you should try and challenge yourselves more. Try your hand at some stick animation, or some full body (although i'd definately recommend starting with sticks). Unless you give your animations an actual consistant subject (like a stickman) and try and make it move realistically, you'll never progress.
Good Luck with it.