Nice game! I think it's really neat that the shapes are all different, so estimating if one is larger than yourself is a bit of a challenge. Curious what counts for size... actual number of pixels in the shape? Area of the bounding box? Also, it is interesting that at some point when you get very large, it becomes harder because shapes start overlapping and so there is an actual challenge to get a high score.
Music is nice and relaxing, but doesn't loop, just a small gripe.