I'll give you a big, generous 7
I don't mind the use of sprites, but the way they were used in this didn't appeal to me greatly. Having to press the space bar whenever a character spoke really bored me to the extent of not reading the text at all. Maybe you should get voice actors for your work next time. As for the fighting, I didn't see anything too impressive about it. Mostly just sprites hitting each other in the sky and plummeting toward the earth.
I see not why this did so successfully. The first two episodes of this series were great, but it got old by the third one. I honestly think it deserved around a 3.6 score, mostly for the effort I see you put into it. It was quite generous of me to give you a 7, but next time try something new. Enjoy your fame while it lasts.