I like the way the world design worked out for a game based on exploration with a short lifespan. You've got to explore the world and come up with a plan before trying to pull off a victory run. That means you'll need to do a bunch of restarting while you're just exploring and figuring things out, which lengthens the gameplay for the size of this world. And the restarts don't get very annoying since the starting point is in the middle of the world and you can go in any direction to explore -- if it were more linear or required taking the same path over and over again on restarts to explore more nooks and crannies at the ends of branches then that would've gotten irritating.
The level design itself was great for a casual game that takes a little bit of planning without going to the degree of turning it into a logic puzzle. The element of age with changing abilities adds a new dimension that I don't remember seeing before in a game like this and it was pulled off well. Graphics are adorable and the dynamic music correlating with age is a great touch. Game mechanics are smooth, and the intangible fun factor is high. I'm really surprised the game doesn't have a higher rating; the only downside I can think of is needing to restart from the beginning a lot, which I didn't think was really all that annoying with this level design.