It's good, but there are one or two issues that need ironing out.
I think that the plot is nicely detailed, though having some areas where there are vocal lines and others which are the text box did interrupt the flow for me. One or the other, but not both should be the rule of thumb. Since you used te sound effects quite well, I'd suggest progressing to full vocal.
Staying with sound, some of the effects are a little quiet, while others are rather loud - I would suggest that you work a little more on making them balanced and allowing your viewers to concentrate on the plot, as opposed to having to adjust their volume all of the time.
Some of the text boxes seemed over full with words - a smaller font would not have hurt, neither would a black strip at the bottom of the frame, to take the subtitles. Some of the animation was a little out of time and untidy, which was a shame. Given that there is so much plot in one of these episodes, the final edit is the key here, getting everything just right, so that it's as impressive as possible.
[Review Request Club]