The narrative was perfect. Would've just liked the physics and interactions to go a little smoother, so that I wasn't fighting with the mechanics and could immerse myself into the story some more.
The puzzles were extremely intuitive!
The combination of physical childhood puzzles and story was an excellent one. You don't even need to be that explicit in your visuals, just audio and the paraphernalia is evocative enough.
The puzzle box reminded me of the viral video "which hole does this shape go into?" "That's right, the square hole"
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You could, for example, pick up a block by it's tip, then the weight of that block vs where your pivot point is would make it rotate to a more vertical position.
Also I appreciate that you have the little cone to help demonstrate where the object is in 3d space, but perhaps a more explicit drop shadow / blob shadow would help line things up easier.