I think it should be rated TEEN not MATURE...
I think it should be rated TEEN not MATURE because I've seen bloodier flash movies than that that're rated TEEN. But that's not my whole reason for reviewing this--I think you did a good job! Good animation, but there's always room to improve. Interesting (but short) plot, but it didn't make me want to watch a sequel to it. Overall I think you did great, though.