Nice Work!
I liked this. The characters all vary in their design and your art style just seems different to others. Some of the voices were a little poor in quality, so perhaps exporting them in higher quality next time would be a good idea.
The storyline was intriguing, it pulled me into the cartoon. Despite their length, the character introductions were very-well produced and I feel they had a 'cool' air about them. Good job!
In the sequel you should push along the storyline in order to keep up interest, and improving the sound-quality wouldn't be a bad idea either. Overall, it was a good watch. Nice work!