Meh.
I'm not gonna do much review and jump straight into constructive critcism.
Firstly, the mouse looked wonky. Particularly the tail. It looked like a leaf glued to its butt, and the waving was distracting. I understand that this was meant to be cartoony, but it wouldn't hurt to study a video of a mouse moving up to something and eating it, just to get the motions down. Secondly, the eating animation seemed a little unnatural. I'm probably a little demanding here, especially because you're a beginner, but generally, the shorter an animation is, the higher quality it requires for a good rating.