love the new uppercut. It has much character. Awesome.
Crits though:
With the uppercut, I think he should start bringing his hand up earlier. You want to get the force behind the rising motion, which is greatest when first pushing off of the ground, before gravity starts to kick in and stuff.
Also, you've lengthened the duration between the attacks.
Okay, so, when he does the first slash, the momentum from that attack would make it more reasonable to carry through into the uppercut using the green arm, since he's already twisting into a motion where using that arm would use the previous momentum. As opposed to, as you have now, using the red arm for both attacks, having to "reload," so to say, before attacking again. This is why people fight using alternating fists.
I think.
One-two punch, you know.
When he jumps the motion blur on the legs disappears too slowly.
When in midair, his twist should continue, since you can't just stop turning in midair, and he's already on a spiral when he leaves the ground.
So far, it's been seeming to me that you're animating the attack like two separate attacks in the same animation loop. I think of combos more like a single attack divided into parts. I mean, the point of combos is to attack in quick succession or with incrementally increasing power. The latter attack is dependent on the former, so while I see that the first attack may need to have a distinct beginning and end (in case you want to stop the combo right after the first strike), there's no reason for the second attack not to flow directly from the last frame of the first.
What I'm saying is: I get your reasoning behind the little jump at the beginning of the second attack, but it may be ultimately detrimental to gameplay, and totally breaks the flow of the animation.
Also, I have no idea what the arms are doing in the first attack
I would make an edit, but I can't, so I won't, but my suggestion would be:
first attack, ending at the last frame you have now
lift red leg, begin to push off with blue
twist back to viewer, green arm beginning to rise
leave ground, green arm rises
continue twist, green arm begins to lower
complete 270 torso twist, land
turn to face original direction
flow into third attack.
Or something like that or something. It would be alot easier if I could show you.