This game (and its early stages in particular) sold me on puzzle maker, and its use case for making games with very simple goals for younger players, and I'm now using it to do the same for my own kid.

That said, the biggest potential for improvement here would be to use a different palette for the eggs and the stones. They're very similar in terms of both color and texture. I eventually saw that the outline distinguished them, but my kid—who felt more like the target audience—couldn't. Plus, it's a good habit to increase visual clarity of objectives.

The ice puzzles remind me of the ones in Pokémon Silver that I loved so much as a kid, fun times.

i like how you pushed the NES Puzzle Maker to even get a little bit of storytelling in your levels, although the level transition effect did at first make it difficult to tell what was going on. On a second playthrough it was clear that you were swapping levels to show the narrative

Good ramp in difficulty. I especially like the puzzles you designed that involved manipulating crates to control your ice slides.