Very nice level but I had to drop a star for 2 reasons. 1. The Mechanism often moved towards B and then the lift was unusable. I even was able to get the mechanism to slide outward over the fence onto the surface. 2. The ball had no anchor and therefore drifted easily from the intended spot (which it did). I know you wanted your level to be small but stability is more or as important. Many creators want their levels to have more challenges but skipping stability isn't the same thing.
I agree with @gmacpro. This level can use a grass level under it, with a wedge to stabalize that ball. I also think it would look better. The free block gameplay was fun.