Really funny how you had an idea kind of similar to my game but with with a cute design, more polish, and an additional gameplay mechanic with a puzzle dimension (you even seem to have the same bug as me with the camera being too high preventing the player to see the ground passed a certain height xD). Really cool game but also really difficult, I couldn't beat level 4, my castle was always toppled :(
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I am using firefox on linux so I could not try your game t.t
The camera going too high is more of a design mistake than an actual bug, I think it could be solved by allowing the player to freely move around the scene.
My main problem is the fact that blocks slowly slides on top of each others causing the tower to topple without actual mistakes from the player. I saw that you used your own engine, did you encountered this kind of problem?