This game is good but there are a few issues I found which range from mild annoyances to making it unplayable. The platform section is the only section I have exclusive issues with as it's unclear at what point you have left the ground when jumping. To improve this I would recommend an implementation of coyote time. I was unable to complete the platform level as I started falling through the later ones. The platform section could also be made more enjoyable if you were able to make the player move with the platform instead of requiring walking to catch up.
I like the somewhat jarring visual style and the save system along with the cube puzzle and the riddles.
Sorry if you found this comment to be too critical, I am just trying to give you some advice.