The walk cycle looked really good, he didn't need to wiggle so much at the end, but if his body does, his hands/arms need to as well. The first one was a good pace for walking, but the second one was a little too fast. It's evident that you're adding frames in post, and so one difference is the blur on the hands, which is a little excessive on the last one. 

And the flip is well....Yeah.

The gun twirl is good, but the added frames messed it up. You may want to tweak the settings in your video editor to keep it from adding them, or at least fix it to simple double them. (Film at 15 FPS, render at 30 FPS.)

Not too bad for being so out of practice!

I assume you're using a frame blending technique, yes? You've just got to watch the warping effect that is evident in the walk cycle test, and find some way to edit them out when you're making an actual film (I know this is a test so it doesn't matter too much in this instance). Other than that, they look pretty good!

^Click to watch