The art is really stellar in this. One thing I would recommend is having multiple faces for the characters so it doesn't look the Sour is constantly screaming all her lines... although, that might be part of her character haha.
The attack animation is fucking sweet! I love seeing the bullets fly across the screen like that, followed by the funny dialog from the characters.
Also, the 'bad-translations' thing is amazing. Seriously, maybe you think it's a minor little thing, but it adds so much to the 'feel' of this, and really boosts the experience of this entire game by a lot, at least for me. Nice touch :)
Overall, it definitely feels like you put a lot of care and polish into this game, well done. I had a great deal of enjoyment from this one!