So, Fun little game. Puzzles were really simple, but at this point that really doesn't matter, and ya, Sylvia was a bit annoying... While I do love my self some growing Ladies, I've personally never been a fan of size theft or shrinking stuff.
If you ever decide to continue with this game or one with a similar idea, I'd love to have a bit of control over how and/or how much she grows, with the player shrinking stuff as part of a give/take system, like most puzzles have a really easy way of completing them as well as a longer harder solution, and if you take the easy route that's when you shrink. On top of that I'd be cool if you had the option to grow her curvier as well as taller, or with some puzzles you had to choose between making her taller or growing her breasts for example. Also something I thought up while typing this is maybe the growth magic makes her more susceptible to suggestion, so in-between puzzles you can talk to her, and steer her toward being more kind or evil as she grows.
Again These are all just ideas I had while playing, can't wait to see what you put out next!