hi!
- i like the sized dolls mechanic idea, would like to see size changing your abilities more so that swapping is more tactical
- the gameplay function of the horn isn't really suitable for a puzzle game, it reveals the end goal of the level in the middle of one, when the satisfaction of solving a puzzle should come from figuring out how it to get to the end goal having known what the end goal was from the start
- the geometric stuff i think theres potential for with this mechanic reminds me of how bloxorz does its puzzles, check it out if you havent
- the direction and position the player exits the dolls feels a little contrived/inelegant
tldr nice mechanic but better puzzle design would elevate it
not sure if you wanted this kind of feedback but i like giving it so thank you for the opportunity and the game :)