Really well produced!
I didn't expect so much for a pixel art movie, the amount of details is just perfect :)
The voices sound a bit off at some times, but otherwise it sounds really natural
The only problem I see is the story - even though kind of interesting, it isn't anything really new. I suggest you try making the action a bit more original, it would make it perfect :) Now, I understand you can't completely change the story now that it's started, but you have some opportunity to make something more creative (some idea that you would install over episodes, or if you start a whole new series, etc.), it would be even more interesting to watch :)
But other than this, everything seems fine ^^
Keep up the good work! :)