These all look great so far. Good to see some new animations from you. I haven't seen anything new from you in a while, and now I can see why.
Dark Fight looks awesome. Movements look fantastic, the effects are great and I love that glow around the main character's head. The entire animation has a certain atmosphere to it that I like a lot. The jump movement at the start had great anticipation and the 3D on the leg looked good when the character was in the air. The entire pose had a lot of power to it.
The blades of grass that went into the air looked good, however, when the jump created that huge crater I would have expected to see some debris flying from the crater. A few rocks and particles there would have looked great.
Memphis tribute looks like it's coming along well. The fast cuts between each shot keep an action feel in the animation. I think the screen with the "Go! Go!" text could last a bit longer, maybe somewhere around 5-10 frames. I like the close ups and blurs.
Short combo was ok. I thought the punches were animated well and it was cool that you attempted the 3D. On frame 27 it would have looked better to make the back lower-leg bend the other way. I just edited it then and it made the stick-man actually look like he rotated, whereas before I knew his body was rotating but it didn't feel like it was. I thought the effect at frame 49 looked cheap. I can see why you did it though. It does add more power to have a flashy sort of effect, but it can only compensate so much for the lack of power. If you had some anticipation by showing the character throw their arms back and lean forward, then throw their arms up and jump it would have loads more power.
Your file with the slight edits I made.So keep in mind that having anticipation gives a lot of power to a movement depending on how much you have, how much the spacing speeds up in the attack movement. A good example is the Dark Fight animation where you show anticipation before the jump. As a result it's much more powerful.
Swordsman has a great zoom in movement and I love the camera angle of the sword. I really, really liked that one.
Deception has an interesting background and the movements look good. I like the colour scheme a lot.
I hope you find this advice helpful. I really like what you're working on right now. I think it's great that you're animating these projects. They're all showing a lot of promise and it's awesome to see more animations from you. I think your style is amazing. :)