It's been a long time since I've reviewed
I really enjoyed this, the animation was smooth, the tweening on the Eggmech was great (been practicing with him for my next animation, a lot of layers haha) You did a really sweet job.
I love how you mixed the Sonic CD sprites with Sonic 2 BETA sprites, felt clean and right (I'm more of a Sonic 3&K era sprite person myself haha)
I'm now going to check your profile for any other animations! Faved, 5'd, and reviewed! Keep it up! Maybe we could collab one day?