The artstyle and vibe of this game are really cute! I had trouble making it past level 5 and had to stop there, but I really like the idea. The rock levels were pretty interesting because you can move into the rock and not go anywhere but "save" that movement for later which is handy.
The difficulty for me comes from the fact that it feels like there is like 1 possible solution out of a million options and you have to get the perfect set of movements to solve the puzzle at all. For example, I basically solved the rock puzzle at level 5 but it didn't count because even though my character moved onto the winning tile, it wasn't their final movement and they just kept going.
Maybe there is a particular way of thinking that helps you solve the puzzles, but I felt like I did not get it from the first couple of levels. Overall I love the idea, it's just that the mechanics/design is tricky to teach I think.