Hot damn! That was quite impressive. But I just can't get over the fact how genious the end was xD
At first you're like "meh, what a lame corpse chasing the main character" and then you realize that it's actually him, stuck in an endless time loop of preventing himself from being doomed, yet not able to change fate...
Anyways, very impressive job! The animations look nice, the shadows are implemented very well and the portal effect looks cool too. Overall, I think you did a pretty great job on this unusual animation, I'd definitely be happy if I created something like that ^_^
Only thing I can think of adding for your next time would be some sound effects and maybe more rough textures ( fur on monkey, blood vessels on the corpse etc.