I like how this game fits the theme in three different ways, with scaling objects, to use a scale, to scale a tower.
The art, sound and overall polish also really nice. However I was confused that I was supposed to get the knight directly on top of the tower at first. Once I understood that, I really liked the base gameplay!
My one suggestion is that you could try changing the tower placement and level layout between levels, instead of just introducing new objects.
Overall great job!