I would love to see your big chunks if your little chunks are 3-5 mins

but seriously:
From the clip of your animation, I think you could brush up on the timing and make the action more dramatic in the process.
Also at the minute things seem a little floaty and not nailed down, it is important to get those key poses nailed down first and then go ahead and animate your inbetweens.
If you don't do them already Playblasts really help you to notice what your animation is going to look like in the final output, and really helps you to notice what stands out and what looks wrong which you can miss while just moving things around constantly.

Hope I didn't come off sounding to nasty, just thought I would try to drop some helpful comments in there.

I do really like the character and the concept and it could be a good piece of animation once the timing is sorted.