Crab Canon

With this month's theme of "Crab" I decided to write a crab canon!

A crab canon is like a musical palindrome; two voices play the same musical line, one from beginning to end the other from end to beginning. It's named after crabs' ability and proclivity to walking forwards and backwards. 

It's pretty tricky to write and have it both follow the rules and sound good but I'm pleased with the result.