This is my first critique on animation so I don't know if it'll be useful or not.

The transitions are fair, i can tell you spent quite a decent amount of time on this and have made quite a lot of frames for parts where there is a lot of movement. You've also cleverly looped where necessary such that although repetitive it's believable.

Like the slight humour in this. The art itself is very nice, the tones, shadows are simplistic. It could do with a couple more frames where she puts the lollypop in the grim's mouth as the transition gets a bit choppy. The blast is pretty awesome and otherwise overall this is a nice animation clip. Only improvements you could have would have been the hair when she is walking, otherwise I can understand how much more work just changing that could mean.

On the whole I really like this.