These are all really nice! Sorry I can't offer much criticisms though. I can't, partially because I'm not too familiar with the objects you're portraying, and partially because I think there really isn't much to improve on, anyway.
Nevertheless, I, too, love the jumping sword-guy, and it inspired me to try and make something similarly "simple" in style:

I admit it that it's rather lazily done, but I had fun while animating it nonetheless!

Are you working on one too, cels?
I'd just love to see more of these crop up.