I like the game! The only thing I would change is changing from click and drag to click to move however that's just my preference! Continuing, I really like the mechanic of having to re-stack to another pillar after getting the first.
Slight note, it looks like there is a type in the instructions. "The targer peg is the one labeled..." Also, I'm a little dense so I would recommend mentioning the red pillar in the instructions specifically. Otherwise I think this is a great rendition!