Sweet!
Protoman was kicking some serious ass! Great work, that's for sure! Your plotlines, for this series, it what actually makes it art. Not a mindless mess of sprites, even if they were custom made, all that works together... Why am I telling you this?!?! You already know that! Well, it never hurts to repeat advice... usually.
Suggestions for next one: (though there aren't really many)
1. Try to animate the limbs separately (not necessary). You don't have to go to the extreme of something like Super Mario Reloaded, but like Sonic the Swordsman, where it's done, but just enough to get the wanted results.
2. Keep it as good as the latest 2 episodes. If not, better.
That's about it. Keep up the great work!